Muscle that does not exercise for a long time will produce lactic acid, so soreness is a normal feeling. As long as you persist for a few days, this feeling will naturally disappear. In addition to running, I think doing push-ups in the morning can exercise leg muscles, doing sit-ups can exercise waist muscles, and the rest can be targeted to buy some sports equipment, and the effect is also very good. The key is personal perseverance. Everyone wants to find a shortcut, but opportunities are often reserved for persistent people.