The Karate back stance uses 4-6 stance (wider stance). It's different from the XY 3-7 stance (narrow stance). That 10% difference on weight distribution makes the XY system different from other CMA system (such as the long fist system).
The back stance/ kokutsu dachi is held weight distribution 30/70..if that what you men 3-7 ?, its a common stance.
The advantage of the 3-7 stance are:
- harder for foot sweep.
- faster footwork.
- better groin protection.
- since the back foot is facing 45 degrees forward, it's a better "ready to spring forward" stance (the 4-6 stance back foot is 90 degree instead).
- ...
IMO, the 3-7 stance is the best "fighting stance". It's only used (or emphasized) in the XY system. The XY 3-7 stance is not used in the CMA long fist, Baji, praying mantis, Taiji, Bagua, white crane, CLF, Hong Ga, ...
3-7 stance:
4-6 stance (please check the back foot angle):
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