If you’ve ever started an especially vigorous workout regime with good faith and enthusiasm, only to be met with disappointment as the scale goes past the weight you started with, you may have had a lingering question: Why does exercise make me gain weight? Is there a biological explanation, or am I just unlucky? 

The answer is multifaceted, a physical activity expert told Live Science. Any post-workout weight gain is most likely the combination of a few factors, but crucially, it doesn’t mean you should give up on exercise.

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