10. Punch in. Buy a punching bag or speed bag and go a few rounds. Burns 394 calories an hour.

11. Jump around. Do aerobic moves, bounce or jog on a minitrampoline. Burns 230 calories an hour.

12. Track it. Wear a pedometer from the moment you wake up until the time you go to bed and see how many steps you really take in a day (aim for 10,000 -- you'll be surprised how quickly it adds up!). Burns 150 calories for 10,000 steps.

13. Train in your neighborhood. Take a brisk walk and use your surroundings to perform strengthening exercises. Do push-offs on a mailbox, push-ups against a fence, step-ups on a curb or park bench, lunges up a hill or triceps dips on a bench. Can burn up to 700 calories an hour at a 4-mph pace.

13. Back-walk. Walk backward for variety, which really tones your hamstrings. Walk with a friend, with one of you facing forward, the other backward, then switch each block. Burns 330 calories an hour if you're going 4 mph.

15. Build a DVD library. Buy, rent or borrow aerobics DVDs that will keep you interested and motivated. Log on to shapeboutique.com to check out our favorite workouts. Burns 428 calories an hour.