alright, so i haven't done abs in about 2 weeks (yah, I'm bulking now). So tonight after shoulders I did 20 inclines w/ a 25lb plate (planning on doing 4 sets). after the first set, my abs tensed up completely....i mean really painful. so i just called it a day. now I'm sitting here w/ my pwo and they still hurt....is it just that I haven't worked them in a while? a cramp?