As opposed to the human body controlling muscle growth from within?
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Muscle growth is very costly from an energy perspective. Ever notice how much huge bodybuilders eat? That all goes right into the muscle growth. Thus, there is an evolutionary advantage to having your body only focus on the muscles that it NEEDS. How does the body find out what muscles are getting used? Your muscle fibers get damaged through rigorous use. Then the body repairs it during rest and it comes back tougher and larger. This isn’t a one to one analogy, but if it helps think of a scar; it’s thicker tissue.
It’s not so much that you need to lift weights specifically, but it just so happens that’s a really good (read: efficient) way to do damage your muscle fiber to trigger the repair and growth process.
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