Ah, the sarcomeres shortening—actin and myosin filaments sliding past each other, powered by ATP. Rigor mortis sets in when that ATP runs out, the bonds locking in place. But stiffness isn't just for the dead; I see it in my workers after a long shift at the machines, their shoulders frozen not from a lack of life, but from a lack of movement. So my strength programs always end with active stretches—to remind the muscles they are still alive, and to keep the melody in the body.
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