Here's an interesting question. Optimal cardio for fat burning should be 65-70 percent of your max heart rate for an extended period of time I beleive. When I take clenbuterol however, my heart rate is automatically raised to 65-70 percent of the max. Does that mean, that if I perform cardio after ingesting clen, I'll be in "optimal" fat burning for the cardio??? Like my heart rate will already be elevated, and will the calories burnt then be most likely to be fat, regardless if im lightly walking, or jogging? Just as long as my heart rate stays in that range?