Generally, exercises with higher reps are used to improve muscular endurance, while higher weights with fewer reps are used to increase muscle size and strength.

Does rep building build muscle?

Reps for muscle growth

Generally, between 6-12 reps for 3-6 sets will help to build overall muscle size. Your 1-repetition maximum (1RM) is the most weight you can lift at one time. ... These exercises use more total muscle mass allowing you to lift heavier weights.

How many reps should I do to build muscle?

Choose Your Reps and Sets

Your decision should be based on your goals. The American College of Sports Medicine recommends 4 to 6 repetitions with heavier weight for hypertrophy (increased muscle size), 8 to 12 repetitions for muscular strength and 10 to 15 reps for muscular endurance.