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| 4 Step to produce hook. |
There are two ways to produce a hook. The first method involved bowling technique. At the moment of throwing the bowling ball, the hand should be behind the ball and where the thumb (for a right-hander) is anywhere between 10-o'clock and 12-o'clock, and the two fingers are between 4-o'clock and 6-o'clock. Just before releasing the ball, the entire hand starts rotating in a counter-clockwise motion. The thumb must fall out of the ball first. And then, the middle and ring finger release almost simultaneously, again in a counter-clockwise direction.
The two fingers releasing while rotating is called "lift," where this type of a release gives the roll more torque and therefore more power. This release technique gives the bowling ball its spin needed for the hook. When the two fingers lift the ball correctly, it will cause the thumb to naturally fall out of the ball first, so one does not have to make a conscious effort to remove the thumb before the fingers.
Of course there are innumerable variations in style and technique and the position of the thumb can vary from person to person. Some bowlers, including professionals, will actually roll the bowling ball with just the two fingers, allowing the hand to give the ball even more torque without having to worry about the thumb restricting the spin.

