If you don't know, ask: Why Chinese martial arts push the palm far more than they throw punches

The traditional Chinese palm technique actually attacks people with the small and large stars of heaven, not the center of the palm, with the small star of heaven in particular being the most powerful.

The location of the small heavenly star is the bone at the root of the palm on the side of the little finger, and the big heavenly star is the bone at the root of the palm on the side of the thumb. The small star of heaven is quite hard, and directly connected to the arm, it is easiest to transfer the force, the angle of force mastered, equivalent to the power of the elbow; with the small star of heaven part of the opponent's head or the body of the weak link, it is easy to cause serious injury.

You can use Xiaotianxing to your chin to feel it.