I've found that the best way to help someone find this, or fine-tune it, is to stand in the water at their head, and give them tips.
pressure on your bottom knee, relax the top leg completely, arch your back right here (poke them in the lower back), shoulders flat, use your back arm to rotate your torso away from the boat, etc.
After a few tips you can often lower your hands away from their shoulders, so they're doing it on their own.
Being there to support them as they figure it out and get all the pieces in place is much more helpful than them trying to improve it while constantly sinking and struggling to breath.
URCHIN Portable Anchor
Touring Kayak Paddles
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