The Amazing 37-Minute Workout

Introducing Kettlebells

We've all seen odd-looking workout equipment (foam rollers, countless ab devices...). But kettlebells you've gotta try, even if they do look like iron granny purses. A 20-minute workout with them is worth about an hour on the treadmill!

"Kettlebells sculpt every part of your body -- fast," says Michele Olson, PhD, an exercise physiologist at Auburn University Montgomery in Alabama. Most moves involve swinging the kettlebell up or across the body. All of the weight is below the handle, so your core has to work hard to counteract the momentum. The result? You'll lose inches and be stronger and leaner than ever.

Get a feel for using kettlebells -- and burn about 400 calories -- as you sculpt your entire body with this 40-minute routine.

What you'll need: A set of 10- to 15-pound dumbbells (or kettlebells, from 10 to 45 pounds, $30 to $90; find them at gofit.net) and a mat. Or start with a lighter weight and then move up as soon as you're ready.

How it works: Do this workout as a circuit, moving from one set of exercises to the next with minimal rest. Complete the circuit four or five times. Do the workout two or three days a week.