Q: Is it better to vary reps, or to change exercises?
Aaron, Chevy Chase, MD
Muscle Guy answers from Men's Health
I prefer both. Too much of the same exercises can lead to harmful muscle imbalances, so change exercises every 4 weeks. And although lots of guys perform 10-rep sets, other techniques can quicken muscle growth. For example, alter the number of reps with each workout. An Arizona State study followed men as they used different repetition ranges in each of three training sessions a week for 12 weeks (5 reps on Monday, 15 on Wednesday, and 10 on Friday, for example), and found that their strength increased more than twice as much as that of men who varied reps only on a monthly basis.
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