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"Muscle building" is ambiguous. It may refer to increasing the size of your muscles (hypertrophy) or it may refer to increasing the strength of your muscles. There is a correlation between muscular size and strength, but that correlation is affected by other factors such as tendon strength and bone length.

If you are trying to increase the size of your muscles, generally the best rep range is between about 8 and 15. The double progression method is popular for bodybuilding. Use a weight that enables you to do 8 reps using perfect exercise technique. Try for 9 or 10 reps during the next training session. When you are able to do 15 reps with that weight, for the training session after that add 5 lbs. and drop back down to 8 reps. Repeat the process.

Too many reps with a light weight will not do anything. For example, think of curling a pencil one thousand times-your biceps will not get larger or stronger. So there is a point of diminishing returns-and it varies between individuals and between muscle groups in the same individual.


Typically, upper body exercises are best done with fewer reps than lower body exercises if you are going for hypertrophy. You might try to go between 6 and 10 reps for upper body and between 12 and 15 or 20 for lower body. Experiment and see what works best for you.

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15y ago

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