It is very normal for two days after exercise to cause pain all over the body, mainly triggered by the specific changes after exercise. Without proper physical exercise in daily life, sudden exercise for two days can cause significant muscle damage, and muscle damage can lead to pain. In addition, because a large amount of lactic acid is produced after exercise, and lactic acid cannot be excreted from the body immediately and accumulates in large amounts, and it takes a relatively long time to excrete, so it can cause pain all over the body. The above two factors will naturally recover gradually after a period of time and make the pain disappear.