It's time to throw your weights around! Well, at least swing them. For today's workout of our Better-Body Challenge, we're adding dumbbells to our sweat session to build some metabolism-boosting muscle. This circuit workout, full of multitasking moves, is incredibly effective for toning your entire body in little time. Learn the details of the exercises here, print the workout, then get pumped!
Directions: Warm up with five minutes of light cardio. Grab a set of dumbbells, between five and 10 pounds, and perform each three-exercise circuit three times before moving to the next. Cool down with five minutes of stretching.