Micro tears in your muscle fibers is definitely the best explanation for soreness. Lactic acid is what causes the burning feeling when your muscles just can’t take anymore during a workout. To answer your question of why it can be delayed like DOMS (delayed onset muscle soreness) which someone has already mentioned I don’t know why it’s so delayed. I do know that it’s more delayed for those who haven’t exercised those muscles in a long time. Perhaps the inflammatory process is responsible for it though
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