Deadlifts, low-bar back squats, and kettlebell swings are a great way to utilize the posterior chain.
Reps, sets, and percentages can guide your training goals, but they're not always accurate. Here's another option.
Where the real problem occurs is the whole idea that a machine can move more resistance than the effort put into it.
A focus on multifidus for neutral spine posture is the source of many failed low back rehabilitation programs.
Time for a little high school physics so if you can decide if that fancy cycling gear that saves you a few grams of weight is actually worth your money or not.
Do you remember the lessons you learned in high school physics? Well, you should, because it turns out they're not only relevant to weightlifting, but mighty helpful.