Ah. Making sure there was no pain or fatigue in the hands, forearms, elbows or shoulders. As that could hint to a few different issues.
If it's just upper arm front and back then simple bicep and tricep conditioning should do the trick.
So basically your best training would be Push ups (wide, regular, narrow and all 3 elivated), tricep overhead extensions, curls, dips, pull down w rope, narrow grip barbells, ect
