Five minutes of burpees, jump squats and other calisthenics, alternating with rest, improved aerobic endurance in out-of-shape men and women. By Gretchen Reynolds See more of our coverage in your ...

Workouts you can do anywhere are a game changer. A trendy, well-stocked gym is nice and all, but lifting weights isn't the only way to build strength, improve your flexibility, and master new skills.