Running

Endurance athletes are fueled by a seemingly inexhaustible supply of energy. But is it really inexhaustible?

Sports are segregated by sex. But what happens when athletes don't fit neatly into sport's definition of gender?

The beach may seem like an inviting place to run on a cool summer morning, but is running on the sand good for your body?

Any physical exercise will improve thinking, as long as you do it somewhat consistently and stick with it long enough, according to an analysis of 98 previous studies.

Motion capture reveals that the source of runners' back pain lies deeper than expected.

Running long distances can be hard on the body, but as one ultramarathoner found out, it can also take a toll on an individual's red blood cells.

If you're a long-distance runner, it may be an all-too-familiar scenario: You're partway through your run when your stomach starts to cramp and you need to find a bathroom — immediately.

If you still need to get in shape this year, don't fret — the balmy days of summer provide a great opportunity for exercising outdoors.

Your friends really do influence your exercise habits, a new study suggests.