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Here's a video of him doing it https://fb.watch/m6M-ld1fEE/
Google Lens led me here
https://www.facebook.com/photo/?fbid=252908974271113&set=a.227161110179233He seems to be a professional coach https://www.facebook.com/cruzcontrolmultisportinstitute
More video. He says it's safe https://www.facebook.com/100063796993870/videos/292215056795383
nick_h.
No cable going into the rear brake hole on the down tube.
Both calves at 12 oclock.
It does look AI.