I'll say it, the way Bong Sao is done in what I've seen in the Yip Man line isn't very good. It can't absorb pressure well and isn't that great as a tool in general. I know quite a few people that ended up with shoulder problems due to it.
The people you know that ended up with shoulder problems obviously are not performing the technique correctly. If they did it correctly, there would be zero undue stress of the shoulder joints or rotator cuff tendons.
The only people in that line I've found who have made it work tend to shorten the tool to more of a Laan and use it as a bit of a battering ram.
I wouldn't say bong sau has to shorten to more of a Laan, nor used as a bit of a battering ram to make it work. However it should be performed with more of a compact structure, in what I would describe as a spiraling motion rather than a "a battering ram". The late grandmaster Wong Sheung Leung does a fantastic job demoing exactly how I believe it should be done in this clip. Most Wing chunners I've seen perform their bong sau way too extended lacking structure which places alot of undue stress on the supraspinatus tendon of their shoulder joint causing wear and tear and eventually leading to injury to that tendon.
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