Exercise can boost your metabolism. Building lean muscle mass by exercising can slightly increase your resting metabolic rate (the amount of calories your body burns while at rest). In addition, vigorous exercise can increase your metabolic rate for hours after exercise. This is known as exercise postexercise oxygen consumption (EPOC), but is often referred as "after-burn." Vigorous exercise requires your body to elevate your heart and breathing rates and increases your core temperature. During this elevated state your body is burning more calories until it returns to baseline levels.
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