i think in trade for man being able to think on own, he can't hear the forces of Nature that all else does; cuz of the noise in his head..
So, things like yoga try to recapture needed exercises and stretches, to offer back what is forsaken, from watching other animals. That is why the forms are named for animals, as they also trace the animate stages of existence. Also, expressed here, is a mind body connection. In that if ya can't eliminate wastes physically, ya can't mentally etc.
So the observation is maid that all other animals massively massage their intestines by their locomotion. the S travel of snake and fish, the reaching and compressing of wings, the cross walk of most quads etc. all work the internals.
So, tree climbing is seen as borrowing the exercise sense of our closest matching animal's style of locomotion and exercise. Balanced pulls at different angles, deep stretches and compressions of abdominal cavity from leg work, as well as deep breathing and chest extension and compression of arm work to force diaphragm to massage organs from top (as leg activity massages same from bottom).
Too, i find it curious that we think there is more light under a tree than there is, and think that grass should grow there. But really the leaves are green because the white light is now lacking the absorbed red(leafing blue and yellow), so is less use to the lower plants(that also favor red for rooting and flowering) as a form of plant competition. It only seems brighter to us, because we see green light best and not as much of the red wavelength, like we've adapted/been thinned to those that had that quality as main breeding stock.
