When gauging the volume of an exercise for muscular gains, the "Rule of 24" is something to keep in mind. Basically the Rule of 24 means that the product of your sets and reps should equal 24. For example, when benching you could do either of the following:
3 sets of 8 reps
8 sets of 3 reps
4 sets of 6 reps
6 sets of 4 reps
5 sets of 5 reps (yes, it's 25 but the idea is the same)
2 sets of 12 reps
12 sets of 2 reps
Of course, when you get into the 2,3,4,5 rep range, you are working more on strength gains. 3 sets of 8 reps is always a nice median.
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