Treadmills and bikes, indoors versus outdoors

Photos: 10 ways to burn calories without stepping foot in the gym
Good belly-slimming laugh – Laughter is not only the best medicine, it is the most effortless way to burn calories. Chuckling through a 15-minute stand-up comedy routine can burn between 10 and 40 calories. And this feel-good activity releases a feel-good hormone called serotonin that could reduce appetite.
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