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Sets and reps are the terms used to describe the number of times you perform an exercise. A rep is the number of times you perform a specific exercise, and a set is the number of cycles of reps that you complete. For example, suppose you complete 15 reps of a bench press.
A rep is the number of times you do it. So, 12 reps would be your repeating the exercise 12 times. A set is the 12 reps,or however many reps you do at one time. If you want to gain muscle, you do a lesser amount of reps with heavier weights.If you just want to tone, you do more reps with a lighter weight.Generally you do as many reps as it takes to reach failure (you can't do any more). Then you rest and do it again.f you want to gain muscle, you do a lesser amount of reps with heavier weights. If you just want to tone, you do more reps with a lighter weight. Generally you do as many reps as it takes to reach failure (you can't do any more). Then you rest and do it again.