So I actually thought that your fist can be horizontal to the floor (palm facing down) or vertical (thumb up) when throwing a hook. It comes way more natural to me to throw the hook (left or right) with my hand in a thumb up position, the other way was just not comfortable enough. I then come across this Freddie Roach video where he insists on the palm down position for hooks and doesn't even consider the thumb up as an option or variation. So I decide to try it out a few times but every 2 or 3 punches my wrist kinda bends, this happens especially with full power hooks. I must specify that my wrist is probably small for a 30yo man whilst my hooks are quite powerful and my arms and forearms are quite big when compared to the wrist. On the other hand, I have no proble whatsoever throwing thumb-up hooks and I feel I can get all the power into them.