You burn fat all day long, even while sleeping. So, techically, you're always in "the fat burning zone."

Assume the theory that losing fat is about energy in vs energy out. You want to use more energy than you're taking in.

Intense interval workouts burn more total calories (given roughly the same length of time - say 30 minutes on a treadmill.) Additionally, according to this author, you burn more calories post-workout after doing intense exercise.

Hann-girl - you're so right. I forget that most of the population would rather have a root canal than a step class (how's that for a visual?) Maybe it's good. Imagine the bike lanes crowded with beginners weaving in & out...

Happy Thanksgiving everybody!