Endurance

Triathlons

Americans are lining up for marathons, triathlons, and adventure races in record numbers. Here are five of the nation's premier triathlons and the best reason to enter each one.

Adventure Races

Americans are lining up for marathons, triathlons, and adventure races in record numbers. Here are five of the nations premier adventure races and the best reason to enter each one.

Multisport Tracker

Seven iPhone and Android apps to help you keep up with your training schedule, including the Endomondo Sports Tracker Pro multisport app.

Bike Booster

Seven iPhone and Android apps to help you keep up with your training schedule, including the Cyclemeter road biking app.

Singletrack Search

Seven iPhone and Android apps to help you keep up with your training schedule, including the Trailhead mountain biking app.

Triathlon Talk

Seven iPhone and Android apps to help you keep up with your training schedule, including the Epic Runner marathon app.

Hit the Road

Seven iPhone and Android apps to help you keep up with your training schedule, including the GPS Run/Cycle/Walk Tracker Pro app.

Bodywork: Pulse

Outside brings you the hottest fitness and health trends for summer, including how to boost your Vitamin D, improve your cycling workout, and the benefits of swearing.

Hot Tip: Workout in Hot Weather

Outside brings you the hottest fitness and health trends for summer, including how to improve your cycling workout.

By the Numbers: 56

Outside brings you the hottest fitness and health trends for summer: reduced mountain bike injuries.

I Couldn't Be More Positive

Instead of profiling an ordinary weekend athlete who cheats by taking performance-enhancing drugs, Andrew Tilin, an amateur bike racer, served as his own lab rat and spent a year taking supplemental...