Anyone else experiencing muscle cramping while on? On several occasions I've experienced severe cramps in my abs doing sit-ups, where my entire mid-section cramps up tight and it hurt like hell. I had to stop and try and relax so my muscles would stop twitching... On a daily basis, my forearms will cramp but only when I extend my arms too fast. Weird thing is I only cramp up in those areas. I only get the forearm cramps when I'm running test, but I get the mid-section cramps when running tren, mast, or clen... anyone have any idea about this or experience this?