Test your ticker, upgrade your eyes, strengthen your knees, eat smarter, and more with our interactive map of the human body.

Why going hard by day and night is killing you, and what to do about it.

Time to wipe the cobwebs off your bike, oil your chain, and kick your fitness into a new gear. Here's how.

Knees are critical joints, and they can't be traded in like last year's cell phone. Keep your hinges state-of-the-art with our complete guide to strength, conditioning, and injury prevention.

Outside's 2002 National Magazine Award-winning five-step fitness program.