Muscle legs can be slimmed down by prolonged aerobic exercise, stretching after exercise, and injections to slim the legs. 1. Long-term aerobic exercise: long-term aerobic exercise can not only consume body fat, but also consume human muscles. So if you want to lose leg muscles, the first choice should be long-term aerobic exercise, such as jogging, fast walking, cycling, etc., each time at least 30 minutes or more. 2. Post-exercise stretching: You can stretch the flounder and gastrocnemius muscles on the back side of the calf before running to reduce their involvement in the exercise process, so as to achieve the effect of thinning muscle legs. However, it may take a long time for the obvious effect to appear. 3. Injecting thin leg injection: Injecting thin leg injection is also a good way to improve muscular legs, but thin leg injection is time-sensitive and generally can be maintained for 6-8 months, so if you want to maintain it for a long period of time, you need to inject it frequently. When patients need to thin muscle legs, they should make gradual progress and should not be in a hurry. They should use the leg-slimming injections under the guidance of doctors to avoid causing adverse effects.