Your high braces are too high and too far behind you, in my opinion. That exposes your shoulder to injury. Keep that "wet-side" elbow tucked to your rib cage, and perform the brace while sitting upright, not lying on your back deck.
You don't show low braces - I'd focus on those, as they are also useful, and safer. Best to go for a low brace if you can, and if you need a second try, you can go to a high brace.
Overstock Outlet Foods
Pull-Up Strap Handle Kit
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