Hi there i think your wasting alot of effort and time using 12-15 reps range, i feel 8-12 reps is a great way of building strength and mass if you want both, 12-15 reps is very much for endurance. Check out the Rep Range chart below.
Rep range Percent of 1 rep max Training Effect Goal desired
1-5 reps 85-100% Neural Strength & power, little hypertrophy
6-8 reps 75-85% Neural & metabolic Strength & Hypertrophy
9-12 reps 70-75% Metabolic & Neural Hypertrophy & some strength
13-20+ reps 60-70% Metabolic local endurance, some hypertrophy, little strength
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