I can't speak for others, but for me it happens naturally...Meaning I do not think about it, it just happens!!
If I think about it and try to do it, it does not work...LOL
I know that makes no sense, but for me it has to happen without me trying to force it ....I guess is what I am trying to say.
As for the advantage of either cupping or breaking, I have no idea!! I have always been told to break the wrist when trying to reduce hook, and cup the wrist to increase hook, so how this comes about I really am not sure, I only know it happens when I release the ball.
If I had to guess...
I would say it is the weight of the ball pushing my hand/wrist backwards as I am trying to lift up on the ball with my fingers at the point of release after thumb exits.
But this is only my opinion of how it seems for me when I am bowling.
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