The inner and outer thighs are gallbladder meridian and liver meridian, respectively, as well as lymph. Knocking on the door can eliminate edema, promote blood circulation and make legs slim.

However, it will take at least a month to see the effect, and you should always knock on the door after losing weight, otherwise it will rebound.

But knock hard, don't be afraid of pain, just don't do it, just don't do it. When you knock, it won't hurt.