Uchikomi in its most basic form is controlled impacts with maximum speed on a training partner. It looks dangerous, because it potentially is. However, even though the maai is exact (which, if not controlled, would severely hurt the training partner), and the speed/power is maximum: the waza connects but does not damage them. This is the epitome of 寸止め (Sundome). Just to confirm—THIS IS NOT SPORTS KARATE. The point of sundome is not at full extension, or penetration of the weapon. Therefore, if sundome is not adhered to, the percussive impact on the opponent will be at its maximum. Clearly, this is impossible, even for professional fighters: as this would result in an abundance on injuries—which would be nothing more than nonsensical.
© André Bertel. Oita City, Japan (2020).