Originally posted by tbulldog
20 minutes balls out=60 minutes walking....choose your poison...

tbull

personal trainer(not to show my ass, but to show credibility)
Im not a personal trainer but i do know that by keeping your heart beat 60-70% of your max is best for burning fat as well as the max for burning calories. When you go higher you start taping into your muscles for energy instead of fat. 20 minutes of balls out isnt as good for burning fat as 60-70% is. Most likely you'll also lose your hard earned muscle from going all out in aerobics.