A recent study examined the relation between age, length of race, and performance in ultra-marathoners.

A new analysis of thousands of ultra-marathon runners revealed patterns in foot strike, stride length, and blood markers.

I’m not prone to either exaggeration or emotion, but I thought "Desert Runners" was one of the most entertaining stories I’ve seen in ages. I loved every second of it.

You would think running a marathon every day for seven days straight might have a bad impact on your health, but a recent study suggests otherwise.

Surprising research shows longer races might be safer and less damaging to athletes.

Think you're too old to run an ultramarathon? Think again. A new study shows the majority of ultramarathoners are what some might consider "too old" to run crazy long distances.

New research tells us a bit about the participants in two of the world's most infamous ultra-endurance events: the Spartathlon in Greece and Badwater race in Death Valley.

In honor of our writer Andrew Read doing the Iron Man Melbourne this weekend, we're sharing one of his favorite videos. Meet David Goggins, U.S. Navy SEAL and ultrarunner.

A recent study showed that ultramarathon runners lost 6% of the gray matter in their brains by the time they completed their race. Are endurance sports bad for your brain health?

Ultrarunner Micah True, known to many as Caballo Blanco, died in March on a training run. Was his death indicative of the dangers of ultrarunning? Science takes a look.

The size of your glutes doesn't matter, but your running technique sure does. Experienced ultrarunner Stephanie Case gives her top five tips on how to run better, further, and faster.

If you like to temporarily deprive yourself of sleep, hygiene, and your sanity -- and if you have a sense of adventure and a love of running, then the Ragnar Relay might be for you.