"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." POP QUIZ: HOW many reps and sets should you do per exercise to build muscle? If you’re in the know, ...

THE CLASSIC SITUP is a workout staple. Whether you learned how to do the movement in gym class or from watching a Rocky training montage, you've probably performed more than a few sets over the years ...

Aerobic fitness is a strong predictor of heart health and longevity, and it can be improved with weekend-only exercise. Exercising only on weekends can still be beneficial, provided the same total ...

The following cheat-sheet will give you an idea of how many rest days you need a week, depending on your goals: ...