5. Try musical jump-rope. Put on some great music and jump to the beat; use a boxer's shuffle or any other jump step you know. Burns 658 calories an hour.

6. "Sock skate." Put on a pair of socks and simulate skating on a hardwood or tile floor. Burns 400 calories an hour.

7. Step it up. Sidestep, hop, jump, run up and down stairs, or take them two at a time. Burns about 360 calories an hour.

8. Rock 'n' walk. Download new music to accompany your walk. Check out our monthly playlists (link: http://www.shape.com/workouts/playlists/) for ideas.  Burns 330 calories an hour.

9. Pick up the pace. Walk through your neighborhood, adding one minute of speed-walking or running every five minutes. Burns about 400 calories an hour if repeated 10 times during the course of an hour's walk.