The body is a terrible motivational speaker. At first, it shouts. Begin lifting after a long absence and every staircase becomes a personal enemy. Sit down carefully. Laugh carefully. Even sneezing begins to involve negotiations. Then the body adapts. The same training can stop producing dramatic soreness—not necessarily because it has become useless, but because muscle and connective tissue have learned the insult. Exercise scientists call part of this the repeated-bout effect: after unfamiliar work, later exposure to similar exercise usually produces less damage, weakness and soreness. The body has not stopped listening. It has stopped screaming. This matters because we have built a small religion around pain. If the workout did not hurt, we assume it did not work. If life is not visibly punishing us, we suspect we are not progressing. Pain is evidence that something happened. It is not a calibrated receipt for growth. Delayed-onset muscle soreness is influenced by novelty, ...
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