Anatomy texts name roughly 600 skeletal muscles, the ones that pull on bones and show up when you move. The exact tally shifts with how tiny slips are counted, but the total sits above 600.
They work in pairs and teams. One set bends a joint, another straightens it, and stabilizers keep the motion from wobbling. Most of a quiet day is this coordination, not a single hero muscle.
Heart muscle and the muscle in the gut are separate crews. The 600 are the ones with a bone to move.
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