Protein is one of the main building blocks of muscle, and exercising is essentially the intentional strengthening and damaging of muscles to build them. Working out you burn calories, carbs, fat, and protein, and you won’t build muscle if you aren’t consuming more protein than you are using for energy in working out. If you don’t work out and consume these it will do nothing if you aren’t exceeding your caloric intake, where if you are you will eventually gain weight as fat.
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