20 minutes

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It's possible that 20 minutes a day won't give you the "perfect" body you desire. However, 20 minutes well-spent can make a world of difference. In 20 minutes, you can run over a mile, do the P90X ab workout, burn tons of calories on any cardio machine. 20 minutes is 20 minutes more than doing nothing. The same holds true for 15, 10 or even 5 minutes. If you don't have a large block of time to devote to exercise, squeeze in small bouts wherever and whenever you can.