The size of your bulging biceps is mostly made up of glycogen or some other sort of energy store, covering the muscle fibers and providing protection from wear and tear.
Depending on the kind of exercise you do, it is possible to have muscles with very little of this padding. That’s how you end up with skinny dudes who can lift many times their weight.
Plus, if your visceral fat (the fat on the inside of your body, coating your organs and such) gets burned off by working out and you gain an equal amount of muscle, your weight will stay the same. Your waist should go down, though.
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