Walking Workouts for a Greener Planet

Interval Walk

Calories burned: 105-140

This quickie walk alternates bursts of very fast and moderately paced intervals to blast fat and kick-start your metabolism. Follow your rate of perceived exertion (RPE) as a guide, using a scale of 1 to 10. "Match the intensity to something you can relate to," says trainer Teri Ann Krefting, star of Crunch's Belly, Butt, and Thighs Bootcamp DVD. For example: The warm-up and cool-down should feel like you're trying to get through a store before closing time, the quicker speed is like rushing to meet a friend when you're late, and the very quick intensity is like dashing to get to the plane before the gate closes.