Most people have problems with cramping while on clen. I drink a TON of water on clen as well as take taurine while on clen. However, I have found that if I have one of my insane workouts and sweat like crazy that I get pounding headaches (due to blood pressure) and a few cramps here and there. I would not go to the sauna while on clen as you will dehydrate yourself and lose precious electrolytes that you need during a clen cycle to prevent muscle cramping. If you have to go to the sauna, do it after the cycle (most cycles only last 2 weeks at a time anyway).