Performing 3 sets of 12 reps for the exercises your workout is likely killing your gains. Now, don’t get me wrong…I actually like the 10-12 rep range when it comes to building muscle and when the goal is muscle hypertrophy. The problem is, the focus is misdirected as it often times gets put on the number of reps and not the quality of the reps or the time it takes you to perform them.