A new book on willpower asserts that it's a muscle. That is, you can strengthen it with practice, and you can exhaust it with stress and overuse. This makes sense, and years of research back the idea.

It’s not just in your legs. Scientists have discovered a "fitness switch" in the brain that must be flipped after a workout for your body to actually build endurance.

A recent study looked at the effects of aerobic exercise on muscle mass and found that while it doesn’t help to build muscle, it can help maintain it. Researchers and experts suggest strength training ...

Running may help burn calories, but when it comes to preventing diabetes and obesity, pumping iron might have the edge, according to preclinical findings from the Fralin Biomedical Research Institute ...