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Re: Ueno Chimp Rolls
As a newbie injury (distinct from shoulder separations in more experienced folks, where it generally result of weird accident) shoulder separation seems most often to be result of either unbendle arm collapsing or of diving from hand contact to shoulder contact.
IME even when newbies are taught slowly from kneeling wither without direct placement of shoulder on ground, at some point early on each student has to transition to rolling over the unbendable arm and across the shoulder to do a classic aikido roll, and that is when the danger of either collapsing or diving happens.
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