Originally Posted by M.W.
That's completely 100% false. You burn your carbs first, then your fat, then your muscle mass. Which is why you lift first rather than run first. The lifting will burn your carbs, the high intensity cardio session will burn the fat.
Also, why in the fuck would you want to do an extra 30 minutes of cardio when you could do the same amount of work in a lesser amount of time? That makes no sense at all. Time is an important element. If you're not sweating and working hard then why work out in the first place?
Actually your wrong here. High intense cardio is bad because you already used your glucose during your weight work out. You are burning through your muscle by doing high intense cardio. Why do you think cardio equipment always has fat burning zone listed at low heart rates?
You don't really start burning anything until 30 minutes in of cardio. Your high intensity should be your weight work out. If you have enough energy to do high itensity cardio, then you didn't hit the weights hard enough.