Thanks for this. Bracing seems the only way to go with push-ups and hitting bags too.
I've heard one line of CLF teaches the thumb pulled back to public students, and braced style to closed-door students. Is that a common practice?
Also, are there any other examples of fist formations traditionally taught differently to public and closed-door students? It's the 21st century now, so I'm assuming we're in the clear to talk about these things.