When a person is trying to build muscle does your arm length change the number of reps you should do?
Not at all, rep range should be between 8-12, with moderate loads. What dictates how muscular you'll be is the muscle fiber type (fast twitch or slow twitch).
Nope. Has nothing to do with it. I dated a bodybuilder for 8yrs so I learned a lot lol
Doesn't have a thing to do with it. Reps are what count