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Clench your fist for 30 seconds! Dr. Iris Hung, from the National University of Singapore, says clenching the muscles in your hand boosts electrical activity in the prefrontal cortex, the area of the brain responsible for self-control. And that extra brain activity literally helps strengthen your willpower. Dr. Hung says clenching your fist for just 30 seconds can help you stick to your diet, eat 250 calories fewer calories a day, and lose 3 pounds a month. 

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