Quote Originally Posted by kfrost06
I had the same problem, I tried clen and went swimming and thought I was having a heart attack, my heart was out of control, I wouldn't touch it if wrestleing plus they can test for it too. Stick to diet and cardio for weight loss. GL
Precisely what I was referring to.

The more intense exercises should only be attempted after the active-life (the time the drug imposes its effects on the action site) has expired. Thus, one on Clen can wake up and participate in their activity that morning, or take Clen and do so that evening (several hours after administration). Ephedra works similarly, but not quite as pronounced, and typically has a 6-7hr active-life.