Hello Dymtro, "And what is mindfulness of in-&-out breathing? There is the case where a monk — having gone to the wilderness, to the shade of a tree, or to an empty building — sits down folding his legs crosswise, holding his body erect, and setting mindfulness to the fore. Always mindful, he breathes in; mindful he breathes out.http://www.accesstoinsight.org/tipitaka ... .than.html
This is the only subject of meditation for which the Buddha has recommended a definite posture, and it seems encompass the idea that movement ought to be kept to a bare minimum, as any movement would alter the posture.
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