[yogadude]

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is it more about his back or his foot placement or something else?

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Good question. Its everything, back, feet, neck, hips, legs - it's really his entire body. Basically he stacks his vertabrae(sp?) one on top of each and lets he bones do most of the work. Most people use the muscles in their back when they sit and that is why it becomes uncomfortable to sit for a long time no matter how strong you are. You cant see his feet but I would imagine his shins are close to perpindicular to the ground. I would imagine he is quite relaxed. There is much more to it but I am not actually an expert on it. I'm just seeing similiarities between him and people I consider highly self-aware.

yoga