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Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to CuriousKidsUS@theconversation.com. What makes the cells of the muscles contract? – ...
Some people love being sore after a workout because it feels like an affirmation that they put the work in. Other people want to avoid it at all costs because it discourages further workouts for them.