A growing number of seniors are completing marathons and triathlons, shedding new light on how exercise affects the elderly body.
Researchers are beginning to understand how DNA makes some athletes more likely to get hurt.
Some evidence shows that intense endurance workouts can put stress on the heart—but it's probably temporary.
Experts are coming around to the idea that infrequent, high-intensity exercise may be as healthy as regular but more relaxed workouts.
Pediatricians are divided over the impact of marathons on young bodies.
The pre-exercise ritual can weaken muscles, hurt athletic performance, and even lead to injury.
Increasingly, baseball players of all ages are turning to "quick-fix" surgery to keep their pitching skills strong.
Barefoot running shoes and shoes with extra cushioning seek to protect runners—but despite all the new technology, running injuries are no less common than they were 30 years ago.