This is the exact spot where a front kick from the lead leg hurts the most (front kick, as in mae geri, not as in a kick in the nuts). The risk taken/effctiveness ratio is awesome. https://pic8.co/sh/me8rEC.jpeg Right in the middle, "lumbar lymph node". Even by just pressing firmly on it with your fingers, it hurts. It's right on the pelvis/"pubic symphisis" bone, so it gets crushed between the pelvis and your foot, on impact. https://pic8.co/sh/KPTnt6.png Some are famous to have turned that particular kick into the corner stone of their entire striking strategy, it's done with the ball of the foot, it can even be done with the toe if you're used to it; while it's riskier (for you foot, for obvious reason) the penetration is much more painful, stunning eventually. https://youtu.be/dLUhx1f8H6o?t=27