Quote Originally Posted by zoom-zoom View Post
Bonus -- at lower intensity the body burns a relatively higher percentage of body fat...booyah!!!
Well, that's true that of the total calories you burn, a higher percentage of them is from fat. But at higher intensity you still burn more fat. You just have to burn glycogen and replenish glucose on top of it. And the higher intensities aren't sustainable, by definition. Anyone, whatever their level of fitness or deconditioning, can ride 5 miles a whole lot faster than they can ride 100. That's the fat-burning benefit of lower intensity - that you can do it all day. If you only have a fixed amount of time for your workouts, you still get more fat loss with higher intensity.