Whenever I use isolation exercises to train my biceps they cramp up when I flex the muscle for days afterwards. Even driving will cause the cramping. I tried drinking more water, taking more potasium without success. So I've just been doing compound exercises for back. I have pretty good biceps, but I'd like them to be better of course.
Has anyone had this issue, if so what did you do about it? Maybe it would help to stretch them more before and after I isolate? The cramping is very painful.