Yamashiro Yoshitomo demonstrates 'aramed' and 'armed' aspects of this interesting Okinawan Styles (through a series of videos) - although in this short clip there is an emphasis upon 'Senaka No Kitae' or 'striking through the correct use of the back':
As is similar within the Chinese concept of 'Tong Bei' (通背) - or 'correctly passing and mediating energy (force) through region of the back' - a master of this technique is not only fully 'rooted' when stood bolt-upright (and exceedingly difficult to upoot ot push-over) - but he or she can deliever highly destructive blows without first artificially dropping the bodyweight achieved by lowering, widening or elongating the stance (as younger people are prone to do). This radically reduces reaction time and allows a practitioner to effectively 'move within' and 'between' the defensive gaps offered by the oppoment and is a vitally important element of 'Iron Vest' achieved through aligning the bone structure. The relatively 'high stance' encourages and opponent to habitually 'strike' without thinking - only to hit hardened bone enlivened through correctly 'dropping' bodyweight and efficiently 'rising' rebounding force - two sides of the same force operating simultaneously from within the centre of the bone-marrow outward. As I am in no way an epert in Okinawan Karate-Do - I find these videos by accident and then 'decode' their meaning by relating it all back to my experience within Chinese martial arts.
Shifu Adrian Chan-Wyles (b. 1967) - Lineage (Generational) Inheritor of the Ch'an Dao Hakka Gongfu System.