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Muscle hypertrophy (growth) occurs very slowly over a period of weeks, months, and years. I've heard people say that after they started lifting weights, they grew so much muscle that their jeans felt uncomfortably tight and too small. While that may be true, strength training is not the cause. Because muscle is denser than fat, it squeezes the same amount of weight into less space. That means the more muscle you build, the tighter your body will be. A poor diet and lack of exercise, as opposed to a weight-training program, create the appearance of bulk.
Learn the truth to help sculpt the lean, toned body you've always wanted
7 Common Muscle Myths, Busted!