I've just started doing one arm dead hangs during fingerboard sessions and i've read (perhaps from moon, maybe beastmaker) that doing so is more beneficial/safe if done whilst remaining as face on to the board as possible...
i've been doing that but i can only seem to lock my arm at 45 degrees rather than 90 in this position, I'm not sure if this has highlighted a weakness of mine, or that its not possible to lock at 90 in this position, anyone shed any light?