Naihanchi dachi is often treated as a position to reproduce. I find it more useful as a reference point: a way to ask how the feet, weight and trunk organize movement across the kata, especially as the body travels laterally.
Set the base without forcing it
Begin with a width and foot direction that let you settle and shift. My own starting cue is a modest turnout, roughly five to ten degrees, then I adjust to the person and the task. It is a coaching reference, not a universal measurement.
Watch the line of the leg
During a weight shift, I observe whether the knee generally follows the direction of the foot. That gives me a visible movement cue; it is not a medical assessment or a claim that one alignment fits every body.
Organize the trunk
I look for a torso that can stay connected to the base without exaggerating the lower-back arch or lifting the chest into a rigid pose.
Stay ready to move again
From the stance, test a small shift to either side. Notice whether balance and direction remain available, rather than treating the finished shape as the goal.
Naihanchi dachi in practice
This video is an accompanying reference for the stance discussed here.
Transitioning between karate stances · Dachi: stance as movement · How we study movement
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