Stangman no offense but that's the way you use clen. There are many lifters who use an eca with clen. You get so goddam run down on contest prep, some time the only way to get a productive workout is by using thermadrene or an other eca. You also get a better burn during cardio. For years people have used clen 2 days on 2 days off with fantastic results. Sometime in this game there is more than one correct way. I've been stacking eca with clen for years now without problem. Eca affects primarily bata-1 recptors clen affects primarily bata-2 receptors, therefore clen is actually affects cardiac muscle less than eca.