-The yangsheng view is that as waist allegedly leads then everything else follows (think whipping action of invigorating renduam)i (jingluo/meridians) while providing the contraction/release/expansion of the middle, upper and lower jiao. It ends up being a whole body exercise from this point of view. These type of movements assists the lymphatic system through purposeful and habitual movement.
https://pdfs.semanticscholar.org/900c/3 ... 1c4b38.pdfSource
Here are some elements associated with Cloud Hands (yun shou) per a modernist perspective. Exerpted from" Simpler Eight-Form Easy Tai Chi for Elderly Adult" by Fuzhong Li, K. John Fisher, Peter Harmer, and Machiko Shirai
"hand-eye and upper and lower extremity coordination, rotational activities, movement continuity, coordinated breathing, and a clear differentiation between solid and empty stances. ....There are challenges to learning Tai Chi. First, learning its sequence is a cognitive challenge, Tai Chi practice usually involves the need to memorize names associated with each posture and sequence of postures....... Second, Tai Chi practice often requires high levels of coordination between upper and lower extremities, such as exactly where a foot or a hand should be at each moment in a posture
8 shi taijiquan (aka Beijing New Style 8 Form) may be stated to be "simpler" or simple (it is obviously shorter) but there are biomedical/biomechanical forces that have application that many are unfamilar with, or were incapapbe of seeing/visualizing.
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