Watch: Why Exercising Doesn't Really Help You Lose Weight

We’ve been told the same thing our entire lives - exercise is central to losing weight. Alexxai Kravitz, a neuroscientist and researcher at the National Institutes of Health, explained to there are three main forms of energy expenditure and physical activity throughexercise only makes up a very small amout. It does have a myriad of other health benefits, though.