"This weekend, take 15 minutes to figure out how hard you should exercise to lose weight. The answer will depend on a few things, including your fitness level. Then during your workout, measure your intensity. My favorite way to do this is with a heart rate monitor, but you can also use perceived exertion or take your own pulse. Based on your results, decide if your workouts should change. Do you really work hard enough to burn fat and calories?"
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Via The New Media Moguls