I've told my friends and clients for years that if you want to maximize your work-out you should use interval training. We no longer hold on to the belief that you should work-out at a low intensity to burn fat. The bottom line is burning calories. The best way to do this is to incorporate interval training in your workouts. Interval training is when you work hard for a short amount of time (i.e. 1-2 minutes) and then work at a slightly slower pace to recover (i.e. 2-4 minutes).