Add Yahoo as a preferred source to see more of our stories on Google. Should you really slow down your reps in the gym for muscle growth? Does it really matter how long each rep lasts? You might have ...

New research suggests the number of reps you do may matter far less than most people think.

What is the correct amount of reps to build muscle? In the strength world we call that hypertrophy, and the question sounds simple until you ask a room full of lifters. One group will tell you the ...