Looks like they already have good ability in the hips — the kua naturally open, gives them a big advantage in settling into the stance.
I don't know, maybe. But if you look carefully you can see that they are standing facing the wrong direction compared to their feet. I notice these things immediately
In other words, you can immediately tell they are unpracticed.
1. 松開 - Song Kai (Sōng Kāi) – Releasing to Open
When the body is closed, constrained, and filled with Crude Force (力 - Lì), Song cannot occur. To achieve the first level of Song, it is essential first to open the body.
In traditional Taijiquan (太極拳 - Tàijíquán) training, there are various exercises designed to stretch, separate, and release the body’s connective tissues. The expansion and unobstructed flow within these tissues allow the practitioner to begin experiencing the first quality of Song, which is Opening (Kāi). Thus, opening the body is the condition for perceiving Song; and in turn, Song—the relaxation of the tissues—further helps the body to open. We open in order to be Song, and we use Song to open.
When observing the Da Lü (大履 - Dà Lǚ) exercise performed by a skilled practitioner, it is clear that all the joints in the body are open and uncompressed. The tissues have been released and have become free. (Note--the da lu being a similar stance to what is shown).
This
initial stage—Song Kai—begins the process of allowing Qi (氣 - Qì) to circulate throughout the body, which had previously been blocked by stiffness and tension. The tradition refers to this as Kai Men (開門 - Kāi Mén), “Opening the Gates,” meaning the energetic gates within the body. Once these gates are open, Qi and Jin (勁 - Jìn) can move freely, integrating the entire body from the tips of the toes to the fingertips.