When it comes to a good-looking set of abs, lower ab development is especially coveted. Exercises that involve leg movement, such as various leg lifts or the simple reverse crunch, are commonly used to target this area. Is it a valid strategy? Maybe, as you’ll soon learn.

In any case, the reverse crunch is a simple and effective exercise to build and strengthen your abs, improve spine stabilization, and become a fitter, more muscular human being. For many, it’s the first “leg raising” exercise learned, so it’s time you know how to do it properly and reap its benefits.

• How to Do the Reverse Crunch
• Reverse Crunch Mistakes to Avoid
• Benefits of the Reverse Crunch
• Muscles Worked by the Reverse Crunch
• Who Should Do the Reverse Crunch
• How to Program the Reverse Crunch
• Reverse Crunch Variations
• Reverse Crunch Alternatives
• Frequently Asked Questions

How to Do the Reverse Crunch

Even though it’s a beginner-friendly exercise, you have to ensure proper form if you want maximal efficiency while avoiding pain. The reverse crunch is slightly more complex than a traditional crunch because it involves leg movement, torso flexion, as well as spinal control. Here’s how to do it right.

Step 1 — Lie Down in Position

No need for equipment — except for a gym mat if you need some comfort. Simply lie down on the floor. Keep your upper body completely flat, squeeze your glutes, and tilt your pelvis backwards to push your lower back into the ground. This will prevent your lower back from arching at any point during the lift.

Place your arms on the floor by your side, palms down, and use them for balance. Bend your legs and set your feet flat on the ground.

Form tip: If you have trouble keeping your lower back flat, lift your shoulder blades slightly off the ground. This will help you create more tension in your abs and provide more control over your spine and hips. Having an arched back reduces your ability to contract your abs.

Step 2 — Bring Your Knees Toward Your Head

Take a breath into your belly and brace your abs. Tuck your legs towards your face until your hips and lower back lift from the ground. As your legs move, maintain a roughly 90-degree angle at your knees.

No other movement should occur in your body: keep your legs at the same angle, brace as much as you can, and drive your hands into the ground to stabilize yourself. Go slow so that you don’t risk losing posture. In the top position, your hips should be off the ground for maximum ab recruitment.

Form tip: If you want to make the exercise harder, straighten your legs as you begin the movement or after you’ve reached the top position. This creates a longer lever arm and increases the challenge on your core muscles.

Step 3 — Lower Your Legs With Control

Lower your legs slowly until your feet touch the ground and you’ve returned to the starting position. Moving at a relatively slower speed helps you feel your abs working and eliminates momentum.

To keep tension in your core, don’t allow your lower back to arch as you bring your legs down. Keep your pelvis tilted backwards and your lower back pushed into the ground throughout the entire repetition.

Form tip: If your back begins to arch as your legs move, bend your legs more. Shortening the range of motion can also help. Until you have enough total-core control, only lower your legs until you feel your back starting to arch, and then reverse the movement.

Reverse Crunch Mistakes to Avoid

Ab exercises that incorporate leg movement are prone to bad form because many people lose focus. Even though the reverse crunch is probably the simplest leg raise-type of exercise, mistakes are still frequent.

Arching Your Lower Back

This is a frequent mistake with beginners, because many new lifters lack spinal control and core strength. Arching your lower back will decrease ab involvement and shift more of the workload towards the hip flexors.

Is it a bad thing? Well, if you want better-looking abs, it won’t be as efficient. More importantly, this can cause stress on the lower back region. If you want to avoid pain and potential injuries, aim to minimize lower back arching and hip flexor involvement. (1)

Avoid it: Make sure your core is always braced and under tension. When you’re not flexing your trunk, make sure your lower back is firmly in contact with the ground. Do the exercise slowly and with control. Slightly elevate your shoulder blades from the floor to further engage your core, if needed. 

Using Momentum

It can be tempting to allow momentum to take over because it makes the exercise easier, but it will greatly diminish muscle activation. If you start swinging your legs around, you’ll end up using mostly your hip flexors in lieu of your abs, and you risk arching your lower back during the eccentric (descent).

If you’re aiming for muscle growth, this is inefficient as it will also reduce time under tension and you’ll have to perform many more repetitions, and spend more time and overall effort, just to have the same stimulus as a strict movement. (2) This can also put more strain on your hip joints and lower back, possibly resulting in pain or injuries.

Avoid it: There is a certain execution speed at which your body will lose muscle tension and optimal bracing. You should never reach that speed but, unfortunately, you only know it once you reach it. If you’re not sure, simply use a slow tempo — two to three seconds on the concentric (lifting) and two to three seconds for the eccentric (lowering).

Benefits of the Reverse Crunch

The simplest exercises are often the most efficient, and the reverse crunch is no exception. Learn how this lift can improve your fitness and provide benefits that other ab exercises lack.

Abdominal Muscle Growth

They say that “abs are made in the kitchen,” but they are actually made in the gym. A balanced diet and a healthy body fat will only reveal them, but if you want to display an impressive set of abs, you have to train them like any other muscle.

A properly executed reverse crunch will offer significant time under tension and provide a different stimulus than what your abs are used to if you’ve only been doing standard crunches or sit-ups. Incorporating the movement for variety will also help build more muscle. (3)

Core Strength

This exercise will improve ab strength and boost your core and bracing abilities. The reverse crunch teaches you how to transfer energy from your your core to other limbs (your legs, specifically). You also learn how to brace properly for maximum efficiency and strength.

The general principle is similar to squatting, where your core helps you transfer the energy from your legs through your core and into the barbell. The reverse crunch can help you get better at compound exercises which require core stability, making you a stronger and more complete lifter.

Spinal Control

The hard part of the exercise is actually to exert proper ab tension while bracing enough to prevent your lower back from arching. Maintaining this strong position will teach you how to stabilize your spine and efficiently brace your core. Improved spinal stability and control can reduce your risk of lower back pain and injuries, and improve your total-body strength. (4)(5)

Muscles Worked by the Reverse Crunch

The reverse crunch is a trunk flexion exercise, which means that it will mainly target the rectus abdominis, but most of the core will actually contribute. Ab exercises which incorporate leg movement are said to emphasize lower-ab development. Let’s see if that’s true and what muscles it trains.

Rectus Abdominis

This is the famous “six pack.” It’s the most visible ab muscle and goes from the pelvis to the sternum. The main function of the rectus abdominis is to flex the trunk by bringing the ribs and the pelvis closer together.

Now, here’s the tricky part: It is often claimed that you can “target” the upper or lower sections of the muscle. Typically, ab exercises which bring the ribs closer to the pelvis are considered “upper ab exercises.” Movements which bring the pelvis closer to the ribs, like the reverse crunch, are thought to be “lower ab exercises.”

However, the rectus abdominis is still one single muscle (with multiple tendons running across it) so it is always fully contracted. Is it really possible to emphasize the lower separate from the upper? Let’s look at the research.

One study didn’t find a significant difference between exercises in terms of upper or lower ab recruitment. (6) But the exercises were performed with the lifters’ hands under their lower back, which might have caused less lower abs involvement by increasing the back arch.

Comparatively, some studies have found a difference in activation. (7) If the hips are flexed towards the ribs while the upper body remains stationary, the lower abs have been shown to do more work.

So it seems that recruiting the lower abs is highly related to exercise selection. You cannot “isolate” the upper or the lower abs — the rectus abdominis will always work as a whole — but some movements can stress either section slightly more. Properly performed exercises that contract the abdominals by rotating your pelvis closer to your (stationary) ribcage may emphasize the lower abs more than the upper. (8)

Obliques

The internal and external obliques are the “side abs” going from your hip bones up towards your ribs. They are significantly recruited when twisting from the waist or bending sideways.

The obliques are also slightly involved in flexing the trunk, and they work heavily to prevent the body from bending or twisting. They are recruited, particularly in the top portion of the reverse crunch, to stabilize your lower body as it raises slightly into the air.

Hip Flexors

The hip flexors are a series of muscles responsible for bringing the leg up towards the body. These relatively small but powerful muscles are involved in the reverse crunch because of the leg movement. They are particularly activated as your legs are lowered to the ground and raised from it.

If you fail to lift your pelvis towards your torso in the top part of each repetition, the hip flexors (and not the abdominals) will be the primary muscles worked during the reverse crunch.

Who Should Do the Reverse Crunch

Ab exercises can be useful to virtually anyone, so you should likely include some direct ab exercises in your training. Here’s when the reverse crunch, specifically, is most beneficial.

People Who Want to Look Good

If you want to sport an aesthetic physique, then you need to do some direct ab work. One psychology study even revealed that well-developed abdominals are the most desirable body part for men, and in the top three for women. (9)

If you want your upper body to be pleasing to the eye, then including reverse crunches as part of your training will go a long way, especially when paired with a specific fat loss diet and an overall well-muscled physique.

Strength Athletes

Many strength lifts such as squats, deadlifts, or presses require a strong core to support moving the heaviest weights possible. The reverse crunch can help by developing the muscles responsible for increasing intra-abdominal pressure, improving spinal control and stability, and increasing bracing abilities. A stronger core is shown to help make you stronger as a whole. (10)

Sports Athletes

In the same fashion, core strength will help you develop more speed and power if you’re a general sports athlete. (11) We rarely think of it, but running, jumping, and throwing all require core strength and total-body coordination. Moreover, the reverse crunch strengthens the hip flexors, which will are heavily involved in running, jumping, and agility.

People with Back Issues

If you’ve experienced back pain, or want to prevent it, strengthening your abs is just as important as strengthening your lower back. The body needs balance in order to perform optimally. Unfortunately, modern life often leads to muscular imbalances, poor posture, and a lack of general physical condition. The reverse crunch can help you combat these potential lower back issues by improving core strength. (12)

How to Program the Reverse Crunch

As a basic bodyweight exercise, the reverse crunch is quite straightforward to program. You can also add some resistance to spice things up a bit. Adopt these repetition schemes if you want maximal benefit, instead of doing countless low-effort reps.

Unweighted, Moderate to High Reps

This is a common range for ab exercises. Three to four sets of 10 to 20 repetitions with 30 to 60 seconds of rest will do the trick, provided you use perfect form. If you can bang out an ultra-high number of reps, it’s an indicator that you’re using improper form or you’re a beast that needs to add some resistance.

Weighted, Moderate Reps

You can either secure a small weight plate on your ankles and shins or hold a dumbbell or medicine ball between your feet. A load that’s difficult for three to four sets of six to 12 repetitions will provide an increased challenge to build strength or stimulate new growth. It’s essential to keep your form the same or it will defeat the purpose of the exercise.

Reverse Crunch Variations

Perhaps you’ve had enough of lying on the ground or you want to stimulate your abs and hip flexors in a new fashion. Here are some kickass variations that will share the same benefits as the reverse crunch and focus on your lower abs.

Hanging Leg Raise

Hang from a pull-up bar, hanging knee raise station, or Roman chair. To really recruit your abs and not focus on your hip flexors, be sure to curl your pelvis up toward your chest at the top of the movement.

This is an efficient movement because it can easily be scaled down, by bending the legs, or scaled up by aiming to touch your feet to the bar over your head. Moreover, the hanging version will also “decompress” your spine, providing comfortable relief after an intense pulling workout or leg day.

V-Up

This is a relatively advanced bodyweight exercise, but if you’ve mastered the reverse crunch, this can be a progression instead of adding resistance. The v-up is one of the most powerful movements to improve core bracing because it requires a high level of abdominal tension combined with leg and arm movement.

The exercise will teach you to transfer energy efficiently between your limbs, as well as provide a serious workout for the abs, hip flexors, and even the serratus — a key muscle for shoulder stability and performance.

Lying Leg Raise

This is the reverse crunch’s almost-identical twin brother. It appears similar, but subtle differences offer unique benefits. The lying leg raise only involves leg movement without raising the pelvis or hips, so it will focus more on recruiting the hip flexors.

However, as long as you prevent any lower back arching, your abs will get a serious workout as well. The overall technique is less complicated, making it is relatively simpler than the reverse crunch.

Reverse Crunch Alternatives

What if you want to train your abs while emphasizing the upper part? Don’t worry, you’re covered with these alternatives.

Crunch

The direct opposite of the reverse crunch. The good ol’ crunch is often butchered because the range of motion is so short, but when done correctly, it can be a fantastic ab exercise.

Because it only involves upper trunk flexion, this exercise will torch your upper abs. The basic crunch is possibly one of the most simple and effective ways to train the abs.

Cable Crunch

This exercise is favored for its simplicity and for how convenient it is to add potentially heavy resistance. The cable crunch is the bread and butter for any lifter who wants to build a powerful core.

The cable crunch is one of the best ways to develop stronger, bigger abs through progressive overload. A properly done cable crunch will result in superior upper abs recruitment with little to no hip flexor involvement.

Sit-up

The sit-up is the quintessential ab exercise found in many professional and athletic physical fitness tests. It’s highly efficient for building, and assessing, total core strength and development.

Like all crunch variations, you can easily add external resistance with a weight plate or weighted vest, but many lifters find the properly performed sit-up to be relatively challenging due to the long range of motion.

FAQs

Should I do the reverse crunch at the start or at the end of a workout?

Both can be valid tactics. Training abs at the end of a workout is the traditional way to go, and for good reason. By finishing with ab work, your core won’t be as fatigued during the session when you want to be fresh for heavier exercises, like squats.

But if you’re someone that loathes training abs, doing them first will ensure that you don’t skip them because you’re “too tired” after an exhausting workout. You probably won’t be as strong during the first few  sessions, but you’ll likely adapt and benefit in the long-run.

Will the reverse crunch shred my abs?

Unfortunately, no. This exercise will strengthen your abs and stimulate muscle growth, so they can look better, but you have to be able to see them first. The only thing that will reveal your abs is to achieve a low enough body fat percentage.

For that, you need to check your energy expenditure and be in a caloric deficit long enough so that you melt your belly and reveal your six-pack. You can consume less calories, and/or burn more calories through physical activities or cardio.

Reverse Engineer Your Way to a Great Set of Abs

Incorporating the reverse crunch in your training regimen doesn’t just deliver a better looking six-pack. It’s an overlooked way to build a stronger and healthier core. It’s time to stop avoiding ab work, get on the floor, and get those knees up.

References

1. Avrahami, D., & Potvin, J. R. (2014). The clinical and biomechanical effects of fascial-muscular lengthening therapy on tight hip flexor patients with and without low back pain. The Journal of the Canadian Chiropractic Association, 58(4), 444–455.
2. Burd NA, Andrews RJ, West DW, Little JP, Cochran AJ, Hector AJ, Cashaback JG, Gibala MJ, Potvin JR, Baker SK, Phillips SM. Muscle time under tension during resistance exercise stimulates differential muscle protein sub-fractional synthetic responses in men. J Physiol. 2012 Jan 15;590(2):351-62. doi: 10.1113/jphysiol.2011.221200. Epub 2011 Nov 21. PMID: 22106173; PMCID: PMC3285070.
3. Baz-Valle E, Schoenfeld BJ, Torres-Unda J, Santos-Concejero J, Balsalobre-Fernández C. The effects of exercise variation in muscle thickness, maximal strength and motivation in resistance trained men. PLoS One. 2019 Dec 27;14(12):e0226989. doi: 10.1371/journal.pone.0226989. PMID: 31881066; PMCID: PMC6934277.
4. Huxel Bliven KC, Anderson BE. Core stability training for injury prevention. Sports Health. 2013 Nov;5(6):514-22. doi: 10.1177/1941738113481200. PMID: 24427426; PMCID: PMC3806175.
5. Stokes IA, Gardner-Morse MG, Henry SM. Abdominal muscle activation increases lumbar spinal stability: analysis of contributions of different muscle groups. Clin Biomech (Bristol, Avon). 2011 Oct;26(8):797-803. doi: 10.1016/j.clinbiomech.2011.04.006. Epub 2011 May 14. PMID: 21571410; PMCID: PMC3157598.
6. Lehman GJ, McGill SM. Quantification of the differences in electromyographic activity magnitude between the upper and lower portions of the rectus abdominis muscle during selected trunk exercises. Phys Ther. 2001 May;81(5):1096-101. PMID: 11319934.
7. Sarti MA, Monfort M, Fuster MA, Villaplana LA. Muscle activity in upper and lower rectus abdominus during abdominal exercises. Arch Phys Med Rehabil. 1996 Dec;77(12):1293-7. doi: 10.1016/s0003-9993(96)90195-1. PMID: 8976314.
8. Duncan M. (2009). Muscle activity of the upper and lower rectus abdominis during exercises performed on and off a Swiss ball. Journal of bodywork and movement therapies, 13(4), 364–367. https://doi.org/10.1016/j.jbmt.2008.11.008
9. Durkee PK, Polo P, Muñoz-Reyes JA, et al. Men’s Bodily Attractiveness: Muscles as Fitness Indicators. Evolutionary Psychology. April 2019. doi:10.1177/1474704919852918 
10. Kocahan T, Akınoğlu B. Determination of the relationship between core endurance and isokinetic muscle strength of elite athletes. J Exerc Rehabil. 2018 Jun 30;14(3):413-418. doi: 10.12965/jer.1836148.074. PMID: 30018927; PMCID: PMC6028208.
11. Shinkle J, Nesser TW, Demchak TJ, McMannus DM. Effect of core strength on the measure of power in the extremities. J Strength Cond Res. 2012 Feb;26(2):373-80. doi: 10.1519/JSC.0b013e31822600e5. PMID: 22228111.
12. Kumar T, Kumar S, Nezamuddin M, Sharma VP. Efficacy of core muscle strengthening exercise in chronic low back pain patients. J Back Musculoskelet Rehabil. 2015;28(4):699-707. doi: 10.3233/BMR-140572. PMID: 25467999.

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The post How to Do the Reverse Crunch for Strong, Well-Developed Abs appeared first on Breaking Muscle.

The sit-up remains a time-tested fitness evaluation and is an extremely simple and effective way to develop core strength. It’s also developed a debatable reputation for being “bad for your back”. Let’s learn how to perform it, safely and correctly for better abs, more strength, and less pain.

• How to Do the Sit-Up
• Sit-Up Mistakes to Avoid
• Benefits of the Sit-Up
• Muscles Worked by the Sit-Up
• Who Should Do the Sit-Up
• How to Program the Sit-Up
• Sit-Up Variations
• Sit-Up Alternatives
• Frequently Asked Questions

How to Do the Sit-Up

All you need to perform the sit-up is your body and a chunk of floor space. As simple as the exercise may appear, there are a few technique tips to make sure you’re getting results most efficiently.

Step 1 — Lie Down

Begin lying on the floor facing up. Your feet should be flat on the ground with your knees bent. Move your feet slightly forward, away from your glutes, and set them hip-width apart. Having your feet too close to your body, or too close together, reduces leverage and makes it difficult to achieve a full range of motion.

Some lifters choose to have the feet held down in place, either by a partner or an immovable object. This should be avoided because it can decrease abdominal focus, recruit alternative muscles (like the hip flexors), and may encourage poor technique.

As opposed to the classic “hands clasped together behind your head” position, keep your fingertips on either side of your head gently touching your ears or temples. This prevents you from pulling on your head and straining your neck. The back of your head and shoulders should be touching the ground before the first rep begins.

Form Tip: To make the exercise less challenging, begin the set with your torso sitting up, not lying on the ground. This helps to work the “stretch-shortening cycle”, which improves a muscle’s strength immediately following a stretched position. (1) Be sure to lower yourself under control without “bouncing” your body off the floor.

Step 2 — Sit Up

Keep your fingertips in contact with your ears and your feet in contact with the ground. Bring your torso towards your knees by contracting your abdominal muscles. Your head and neck should remain neutral, not pointed up or down, as you move. You should feel muscular tension throughout your entire upper body, particularly in your abs.

To maximally activate your ab muscles, your upper body should curl and “crunch” as you rise up, rather than keeping a straight line from your shoulders to your hips. In the top position, your upper body should be close to your knees and thighs.

Form Tip: If you feel lower back strain during a set, move your feet slightly farther from your body and slightly wider apart. Be sure to start the movement by flexing your torso and “crunching” your abs. Keeping your torso straight de-emphasizes ab muscle recruitment and shifts the muscular stress to the hip flexors, which can worsen back pain.

Step 3 — Lower to the Ground

Begin the descent by reversing direction and “un-curling” your upper body while lowering yourself to the ground. Resist the urge to rebound immediately off the floor, which increases injury risk and decreases muscle involvement. Quickly reset before transitioning smoothly into the next repetition.

Form Tip: In the bottom position, take a deep breath into your belly, not your chest (also known as diaphragmatic breathing). Beginning a rep with this deep breath and steadily releasing it while sitting up can help to increase muscular stress and power output.

Sit-Up Mistakes to Avoid

Many lifters underestimate seemingly simple bodyweight exercises like the sit-up and, as a result, end up performing them incorrectly which lessens any potential results and reduces the overall effectiveness. Here are the most common training mistakes to avoid.

Pulling Your Head Forward

Your torso should be moving up and down during each rep. Your chin shouldn’t be. One big reason for avoiding the popular hands-behind-your-head position is that, deliberately or accidentally, it can encourage you to pull your head with your hands as if you were lifting your entire body with your skull as a handle.

Not only does this not actually help anything, but it can put significant strain on the small muscles of your cervical spine and overall neck. If you feel any increasing strain on your neck during a rep, you’re likely pulling with your hands instead of flexing your abdominals.

Avoid It: Don’t put your hands in a position to help in the first place. Keep your fingertips touching, or nearly touching, your ears so they’re not in a position to pull on anything. Alternatively, you could cross your arms in front of your chest or clasp your hands in front of your chin. Both options remove the urge and ability to pull your body up.

Using Momentum, Not Muscle

Many lifters consider the sit-up to be ideal for performing high-rep sets, which it can be. However, some fall into the trap of using any method necessary to complete extra repetitions. The “easiest” way is to begin using momentum, not muscular force, to get moving.

By swinging the arms as if throwing an imaginary beach ball, kicking the legs, or incorporating hip movement by raising and lowering the glutes off the floor, it’s possible to “swing” the torso up to the finished position. This not only reduces muscle activation in the abs but also increases strain on the joints of the hips and lower back.

Avoid it: Very simply, don’t exchange technique for extra reps. Maintain a controlled crunch of the torso going upwards. Keep your glutes touching the floor throughout the entire set. Keep your fingers touching near your ears.

Benefits of the Sit-Up

For years, sit-ups were the quintessential “workout exercise.” Gotta get in shape? Start with sit-ups. Gotta get stronger? Do your sit-ups. Wanna lose weight? Sit-ups will burn that fat fight off.

Some of these were on the right track, others were a bit misguided. Here’s what the exercise really offers.

Core Strength

The sit-up is an extremely effective exercise for building total core strength. The abdominal muscles are worked through a significant range of motion while the lower back, glutes, and even the hamstrings are recruited as stabilizing muscles.

Ab Muscle Development

Training the abs is, unsurprisingly, a really effective way to build abs that look great. While a variety of ab exercises like crunch variations and twists can also be effective, the standard sit-up remains among a popular and effective choice for activating the ab muscles.

Muscles Worked by the Sit-Up

The sit-up may be one of the most well-known ab exercises. Its straightforward performance, long history, and wide-spread popularity have helped to cement it as one of the few exercises many lifters and non-lifters are familiar with. Here’s a deeper look at the muscles involved.

Rectus Abdominis

This is the main ab muscle running down the front of the torso which makes up the “six-pack” and it’s the primary muscle people are referring to when they talk about the abs.

It’s responsible for flexing the torso in a curling motion to bring your sternum (mid-chest) closer to your hips. This is why keeping your torso straight as you rise up decreases the abs’ ability to contract.

The rectus abdominis is sometimes referred to separately as the “upper abs” above the belly button near the lower chest and “lower abs” below the belly button near the belt-line. While it is one single muscle, research shows that two separate sections can be activated to varying degrees by certain exercises. (2)

Ab exercises with torso movement, like the sit-up, typically emphasize the upper abs while ab exercises with leg movement, like the hanging knee raise, emphasize the lower abs.

Hip Flexors

The hip flexors are a collection of several small muscles found near the top of each thigh connecting to the pelvis and lumbar spine (lower back). They serve to bring the upper leg closer to the chest, in a movement similar to bending at the waist.

The hip flexors are recruited during sit-ups, more so when the torso is kept straight or when the feet are weighted down and held in place during the movement. (3)

Because the hip flexors connect to the lumbar spine, they are heavily associated with contributing to, or relieving, back pain depending on the muscles’ strength, flexibility, and mobility. (4)

Who Should Do the Sit-Up

The sit-up remains a fundamental movement for building core strength and abdominal muscle. It can be incorporated into almost any type of training plan.

Training for Strength

Core strength and endurance have been shown to help improve strength and athletic performance. (5)(6) For this reason, sit-ups can play a key role in any training program designed to build total-body strength or power.

Training for Muscle

All muscles of the body can be stimulated for muscle growth, including the abdominals. The sit-ups are a simple and effective exercise for targeting the abs.

Some lifters mistakenly believe direct ab training may create a “blocky” or bulky-looking waistline, but this isn’t a valid concern because that appearance has more to do with excess body fat than muscle growth.

Similarly, some lifters avoid any direct ab exercise, believing that ab definition is simply the byproduct of a general fat loss plan combined with basic compound exercises. But getting good-looking abs requires some direct work, not just reduced calories, running, and squatting more.

Training for Performance

The sit-up is a popular fitness assessment with some law enforcement and military organizations, often tested for maximum reps in a set timeframe. For this reason, training the sit-up would be considered “sport-specific,” since the most direct way to improve performance is to practice the exercise itself.

How to Program the Sit-Up

The sit-up can be programmed in a number of different ways to accommodate the specific training goal. As with many bodyweight exercises, adding external load such as a weighted vest, weight plate, or dumbbell can increase resistance and allow more programming options.

Unweighted, Moderate to High Rep

Performing the sit-up with your own bodyweight for two to three sets of 10 to 20 reps with 30 seconds rest between sets can be a quick and effective addition to any training program. This approach could even be incorporated into a general warm-up, rather than a workout, for experienced lifters.

Light Weight, Moderate Rep

Add external resistance and perform three to four sets of six to 12 reps with one minute between sets. This would be an intense workout to build core strength. Exercise technique with and without weight should be identical. Adding weight should not compromise form.

For Time

As one part of a physical fitness test, typically in law enforcement or military organizations, sit-ups are required to be performed for maximum reps in one to two minutes. The key with this training approach is to maintain proper technique for the duration and not allow form to get sloppy in order to rush through low-quality reps.

Sit-Up Variations

Because the sit-up is a relatively straightforward exercise (literally and figuratively), simple adjustments to the basic movement can recruit or emphasize different muscles for a more diverse stimulus.

Twisting Sit-Up

Sometimes called knee-to-elbow sit-ups, incorporating a twisting motion recruits the oblique muscles running along either side of the rectus abdominis.

Rather than ending with your chest directly in front of your thighs and knees, end each repetition with your chest pointed toward one knee. Alternating sides on each rep is common, but reps may be performed all to one side followed by the same reps to the opposite side.

Janda Sit-Up

Created and popularized by physiotherapist Dr. Vladimir Janda, the Janda sit-up activates the hamstrings to deactivate the hip flexors. The result is a significantly increased abdominal contraction.

This works by a neurological and physical mechanism technically known as “reciprocal inhibition.” Essentially, it’s a phenomenon which prevents muscles on one side of the body from contracting if the muscles directly opposing it are already intensely contracting.

Straight-Leg Sit-Up

The straight-leg sit-up, like it sounds, is performed with your legs straight and heels on the ground instead of with your legs bent and feet flat on the ground.

This adjustment increases the overall range of motion and significantly increases recruitment of the hip flexors. The straight-leg sit-up is very similar to the Pilates exercise known as a “roll-up.”

Two-Arm Overhead Sit-Up

Keeping both arms raised perpendicular to the ground, rather than close to the body, alters leverage and significantly increases the difficulty. This variation is performed by keeping both arms straight and pointed towards the ceiling throughout the rep.

As an even more advanced variation, you can hold a light dumbbell in each hand or one weight plate with both hands. This will also increase shoulder recruitment, specifically in the smaller stabilizer muscles of the shoulder and upper back.

Sit-Up Alternatives

Some lifters are unable to perform sit-ups, typically because of pre-existing back problems or general difficulty achieving a full range of more. These are some of the most effective options.

Crunch

The crunch may have been the one exercise to bump the sit-up from its prominent spot as the go-to ab exercise. It’s been shown to be one of the most effective ways to specifically target the abs. (7)

The crunch does have a significantly shorter range of motion compared to the sit-up, but that’s one reason why it’s an effective ab exercise. The movement is deliberately restricted to avoid involvement of other muscle groups.

Hanging Knee Raise

Using either a pull-up bar or specialized knee raise station (sometimes called a captain’s chair or Roman chair), the hanging knee raise emphasizes the lower abs. Be sure to curl the entire hip region upwards, rather than only moving the legs, to recruit more ab muscles.

The hanging position also helps to “decompress” the spine by allowing a stretch and relieving tension. This exercise can be made more challenging by using straight legs or eventually progressing to the “toes to bar” position with a full range of motion.

V-Up

The v-up, sometimes called a jackknife sit-up, is a high-intensity total-body core exercise involving the ab muscles while incorporating the arms and legs together. By raising your legs while reaching upwards with your arms, significant stress is placed on the lower abs as well as the upper abs.

This is one of the most challenging bodyweight ab exercise alternatives because it requires high levels of strength, coordination, and mobility.

FAQs

Will doing sit-ups specifically burn belly fat?

Fat, regardless of where it’s stored on the body, is most efficiently burned with a specialized nutrition plan (including a calorie deficit) coordinated with an intense training program. Performing sit-ups and other ab exercises does not lead to any drastic “spot reduction” by significantly increasing abdominal fat loss. (8)

Several decades of research have investigated this persistent idea, as well as countless hopeful lifters over the same time period, and the results have been inconclusive at-best. Any results showing spot reduction to work have been measured in millimeters, not inches.

Time and effort are much better spent on a comprehensive fat loss plan rather than over-relying on spot reducing the abs.

Why does my back hurt during and after a set?

Lower back pain is the most common reason for avoiding sit-ups. This may be due to the hip flexors involvement during the exercise, which stresses the lumbar spine, or the pain may be due to the flexion (crunching) motion aggravating lower back strain. (9)

Modifying sit-up technique by widening the foot stance and shortening the range of motion may help. If pain persists, removing sit-ups from the workout program and incorporating an alternative may be the most effective solution.

References

1. Seiberl W, Hahn D, Power GA, Fletcher JR, Siebert T. Editorial: The Stretch-Shortening Cycle of Active Muscle and Muscle-Tendon Complex: What, Why and How It Increases Muscle Performance?. Front Physiol. 2021;12:693141. Published 2021 May 20. doi:10.3389/fphys.2021.693141
2. Duncan M. (2009). Muscle activity of the upper and lower rectus abdominis during exercises performed on and off a Swiss ball. Journal of bodywork and movement therapies, 13(4), 364–367. https://doi.org/10.1016/j.jbmt.2008.11.008
3. Burden, A. M., & Redmond, C. G. (2013). Abdominal and hip flexor muscle activity during 2 minutes of sit-ups and curl-ups. Journal of strength and conditioning research, 27(8), 2119–2128. https://doi.org/10.1519/JSC.0b013e318278f0ac
4. Avrahami D, Potvin JR. The clinical and biomechanical effects of fascial-muscular lengthening therapy on tight hip flexor patients with and without low back pain. J Can Chiropr Assoc. 2014 Dec;58(4):444-55. PMID: 25550670; PMCID: PMC4262809.
5. Kocahan T, Akınoğlu B. Determination of the relationship between core endurance and isokinetic muscle strength of elite athletes. J Exerc Rehabil. 2018;14(3):413-418. Published 2018 Jun 30. doi:10.12965/jer.1836148.074
6. Shinkle, J., Nesser, T. W., Demchak, T. J., & McMannus, D. M. (2012). Effect of core strength on the measure of power in the extremities. Journal of strength and conditioning research, 26(2), 373–380. https://doi.org/10.1519/JSC.0b013e31822600e5
7. Escamilla RF, Lewis C, Pecson A, Imamura R, Andrews JR. Muscle Activation Among Supine, Prone, and Side Position Exercises With and Without a Swiss Ball. Sports Health. 2016;8(4):372-379. doi:10.1177/1941738116653931
8. Paoli A, Casolo A, Saoncella M, et al. Effect of an Endurance and Strength Mixed Circuit Training on Regional Fat Thickness: The Quest for the “Spot Reduction”. Int J Environ Res Public Health. 2021;18(7):3845. Published 2021 Apr 6. doi:10.3390/ijerph18073845
9. Sutanto, D., Ho, R., Poon, E., Yang, Y., & Wong, S. (2022). Effects of Different Trunk Training Methods for Chronic Low Back Pain: A Meta-Analysis. International journal of environmental research and public health, 19(5), 2863. https://doi.org/10.3390/ijerph19052863

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