When you start exercising, your thighs will hurt. Will it hurt if you exercise for a long time?

If you don't exercise for a long time and suddenly start exercising, your muscles will be sore. That's because anaerobic breathing can produce lactic acid, but with your exercise, this symptom will gradually disappear, often the worst for the first time. Take a few days off and wait for lactic acid to metabolize. Later exercise will get better and better, and the pain will gradually disappear. The important thing is to persevere.