The above is a video on Bili Bili designed for Goju Ryu practitioners in China (or Chinese language speakers around the world). Essentially, Chinese language subtitles have been affixed - with Okinawan-Japanese concepts (cultural interpretations) translated into Chinese philosophical terms. This was uploaded on September 7th, 2022 - but I have not encountered it before. The direction of breathing is explained (stating there are two methods) - with 'kime' (決め) emphasised. This is written as '决定' (Jue Ding) in the Chinese language.
决 (決) = jue2 (ki) - certainty, dredge and kill
定 (め) = ding4 (me) - steady, fix and stabilise
Interestingly, within Buddhist philosophy the Chinese ideogram '覺' is also catalogued (within modern Pinyin) as 'jue2' - and is related in structure to '决' (jue2) which is used above in 'kime'. This means the ideograms share a common root and depicts a related meaning. Whereas '决' (jue2) suggests a mind-enforced control over the body - '覺' (jue2) refers to the achievement of 'enlightenment' through the mind 'waking-up' - a state achieved only through following the utmost disciplined paths of bodily control. Perhaps the two variants of these ideograms are related. I would suggest this is the case on the grounds that '定' (ding4) - the second ideogram used within 'kime' - is also used to translate the Sanskrit term 'Samadhi' - which refers to a method of 'fixing' the awareness of the mind in one place (preventing the surface mind from moving about without control) - and thereby achieving a permanent 'stillness' of mind (which allows for the perception of 'emptiness'). Again, the physical body is subject to the utmost discipline (through the Precepts as taught in the Vinaya Discipline).
The breathing is 'Daoist' in nature and involves a basic filling-up of the dantian with qi (inward breath into the lowest area of the pelvic girdle) - which is then redistributed throughout all the regions of the body (through the outward breath). The retained tension 'pulls' the qi into the dantian - and the maintained muscle tension 'extracts' the accumulated qi into the extremities (both breaths meditated by the awareness of the mind). The 'advanced' breathing is only hinted at and involves the microcosmic circulation of the qi. Qi is breathed into the dantian - which triggers the flow of qi up the Governing Vessel (which runs through the spinal column) and over the top of the head to the upper palate of the mouth. The tongue touches the upper palate with completes the circuit between the Governing Vessel and the Conception Vessel - which starts in the tongue, flows down the front of the body and through the grown and around to the perineum - where the Governing Vessel begins. The Sanchin breathing strengthens and maintains this Daoist breathing.
Shifu Adrian Chan-Wyles (b. 1967) - Lineage (Generational) Inheritor of the Ch'an Dao Hakka Gongfu System.