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

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.

From trainer Jon Hinds, of the Monkey Bar Gym, who's junked the mirrors and machines in favor of real, functional, full-body fitness.

In three decades, we've learned a few things about fitness. Here's the best advice you'll ever get.

Rule number one for total physical fitness? Where your back goes, all else follows. Keep yours in top shape with our guide to strength, flexibility, and injury treatment.

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