The attack technique with the ball of the hand can be executed in different ways. As a basic school technique, Teishō uchi starts from the hip with the back of the hand turned downward.
Teishō uchi appears in many kata and can be lunged in different ways, depending on the situation. On arrival, the hand can be rotated so that the fingers point outwards, upwards or downwards, in relation to the target and taking into account arm rotation.

Here you will find all information about the techniques in the video