I’ll jump in here for some advice. My distal biceps on the left has been painful for about 3 weeks. I can do all back stuff with almost no issues, however any curling movements cause sharp pain. My routine is basically full body lifting 3x/week. So I do some sort of bicep curls 3x/week. I will either do 3-4 sets of one exercise. I’ll rotate between incline dumbbell curls, incline dumbbell hammer curls, cable curls both facing towards and away from the cables. I even throw in a machine curl every now and then. I don’t go super heavy. I will do rest pause or mechanical drops or do isometric holds. I haven’t done any curling since aggravating the tendon. It’s very frustrating! Any thoughts would be appreciated.