I have tiny inner forearms and can't gain any muscle on them.
It seems that moderate to heavy weight does nothing for strength or muscle.
(hammer curls) When I do very light weight very slow with full range of motion and squeezing to failure It seems to work but I can't be certain.
If I even miss a day it seems like to tiny amount of mass I gained goes away super fast(for most of my upper body for that matter)
Also my biceps are very hard to train as well. Any advice on that as well?
My upper body is small boned. It is very hard to push my limits or know how far to push them with out injuring myself.