There are two kinds of situations. The first one is irregular. Can cause joint ligament damage. It's best to find a professional or coach. The second is novice fitness. There has never been a large-scale exercise before, and this will only happen when you do systematic intensive exercise for the first time. This is a good thing to prove that your exercise is effective. Muscle will only increase after injury, that is, muscle fiber breaks and repairs itself. It usually takes about 3 days. Only the first exercise will make the pain obvious, the next exercise will not be too obvious, at most it will be sore, and it will be better the next day. If it's muscle pain, it's okay. If it's joint pain, it's the wrong method.