How many reps should you do to build muscle? A new study just settled the debate

Here's what this means for your next workout.

If you can do 19 reps of this simple exercise after 60, your leg strength is considered elite

Try this simple exercise to test your leg strength over 60.
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This Part Of Your Exercise Reps Is The Key To Muscle Growth—And You’re Probably Ignoring It

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." If you tend to breeze through the "easy" part of an exercise—like lowering into a squat or letting your ...