acupoint selection method: open thumb and forefinger to tighten the tiger's mouth, press the thumb joint of the other hand horizontally on the tiger's mouth, bend the thumb joint forward, and the depression pointed by the thumb tip is Hegu point.

action essentials: put the thumb belly on Hegu point of the other hand and press along the bone edge of the thumb. You will feel comfortable, but it hurts a little. It doesn't matter. You can press it harder.