I have never heard it recommended to push the ball up. It may work for some bowlers, but to my way of thinking it wastes energy and throws off the timing.
Pushing straight out is textbook or perhaps old school.
Hinging is now considered acceptable.
When watching an old video of Earl Anthony demonstrating a four step approach it looks like he doesn’t push the ball outon the first step but just lets his arm straighten out on step two.
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