It is a stressor for muscles, bones, and ligaments that aren’t adapted to such activities. So they break down a little bit if you put them through these stressors, but the bright side is they grow back stronger as a result, making you more fit and making it harder to get sore from the same routine movements once you’ve recovered and adapted.
In short, it is work on the body. And work takes energy. The body likes to preserve energy, so not working is comforting, but avoiding it allows your body to weaken overtime and get “out of shape”.
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