Can anyone tell me if they have ever experienced this also. i have been getting cramps in my muscle so severe that it almost cripples me. i was doing leg curls today very light then suddenly my whole muscle got so tight and painful that it felt like if i moved it it would snap. this also happens if i flex a muscle once in a while and i also get it under my scrotum area sometimes after i pee like a muscle tighting up under there. can anyone tell me why this is happening....servere cramp /pain