Laugh!

Laugh off 40 calories — it's no joke! A study from Vanderbilt University showed that you can burn up to that many calories by laughing genuinely for 10 to 15 minutes. (Watch Groundhog Day to giggle off even more weight.) Did you ever think of laughter as an ab-toning exercise? Well it is!  Plus, it’s a blood-oxygenator, endorphin-releaser, and general body relaxer. Ha HA!  Also, smiling releases serotonin in the brain, which instantaneously give your mood a lift!