great post! simple and to the point! please dont get caught up with myths like doing anymore than 20 minutes burns muscle, and if you work at high intensity your body burns more muscle. You burn a higher % of total fat in grams at higher intensities, just make sure u leave enough time to recover between sessions. i.e. not doing high intensity cardio everyday, remember you will be weight training too which causes deficit hence, the lower heart rate cardio workouts. every workout has its purpose