With respect to number of reps, you have to experiment to see what is best for you. Some people really do well with lower reps, some with higher reps. As a general rule, I find legs respond better for the majority with higher reps - mine got massive working 12-20 rep range, more so than the 4-8 range. Ditto calves where going 15-25 reps is cool. For me, size gains were best at 8-10 reps overall, while I gained strength and power at 4-6 with some singles, doubles and triples thrown in.
I agree ditch the 2 sets and go to 3 - perhaps lessen the number of exercises if time constraints are evident. I'd also consider ditching one of the pressing exercises and subbing in flyes or pec deck for shape and definition on bench day.
I'd say given your loss of 50 pounds and solid strength gains that you're doing really, really well. My hat is off to you - keep up the great work!
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Si vis pacem parabellum.
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