I've always done my cardio and weight training on the same day; 30 minutes of cardio first, then about 30 minutes of weight training. I've heard that it is more advantageous to do weight trainining first so that my cardio routine will burn maximum fat. Does it matter that I'm exercising first thing in the morning on an empty stomach? I read that the body burns "glycogen" as fuel during weight training. Do I have any gylcogen available if I haven't eaten in several hours? Please explain.