How do you know how many reps to do?
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This largely depends on your goals. If you are seeking to build muscle then the science shows that hypertrophy occurs at the 10-12 rep range and this is typically what I have clients do for the first 60 days. After that to make the newly grown muscle fibers as strong as possible I drop the rep range to 8-6-4. This allows us to cycle back up to the 10-12 rep range to again continue building muscle at an alarming speed! 🙂