I have been working out 6 days a week for a few months now. I have never been fat but I used to be kind of slim with a slight beer belly. My abs are starting to pop now, my shoulders are naturally broad but getting bigger, my legs are ok but my biceps suck s bad. I work my arms 2 days a week with dumbbell workouts. I have no gym anywhere near and only dumbbells. I have searched for various workouts on Youtube and yes they have grown a little, but they seem to have hit a wall and any growth is super slow. >Any tips on home dumbbell workouts for biceps?