Im curious if I can gain muscle by using 20lb dumbbells because thats all I have. Let's say for biceps, how many reps and sets should I do with those? By now Im pretty sure my muscles have gotten used to that weight so they're not growing. But getting to rep 12 still isn't that easy. Arnold Schwartznegger spent about 5 hours in the gym everyday. Does he work the same muscle group in those 5 hours?
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