Seidokaikan

Kazuyoshi Ishii’s Kyokushin offshoot, and the organisation that founded K-1 in 1993. That is the single most consequential fact about it: the rulebook nearly all modern kickboxing uses — punches, kicks, knees, no elbows, immediate clinch break — was written here to answer a karate promoter’s question about which striking art produced the best fighter.