I've torn the inner heads of both my biceps. The first was while diving for a ball in softball, hyperextended by arm and the bicep itself tore. Then just last year when we were moving I tore the other one while lifting a box of books, in that case the muscle separated from the ligament. The first one they tried to repair and it was never right (Put an end to my lifting heavy), the second one I elected not to repair. In both cases it is only the inner head so my arm still works fine and I can even do hammer curls, but if I turn my palm up, my arm is way weaker.
Both hurt like crazy.
