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There are two ways to produce a hook. The first method involves 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.
A ten-pin bowler uses a one-hand delivery with thumb having exited the ball before fingers, to achieve axis rotation. A conventional roll of the bowling ball will enter the 1-3 pocket, and continue to roll from right-to-left (right-hander.) The ball only contacts four pins (1, 3, 5 and 9 pins) to achieve a strike. This type of roll/hit applies ...
To grip the ball for a leg-spinning delivery, the ball is placed into the palm with the seam parallel to the palm. The first two fingers then spread and grip the ball, and the third and fourth fingers close together and rest against the side of the ball. The first bend of the third finger should grasp the seam.
Most new players roll the ball straight, while more experienced bowlers may roll a hook that involves making the ball start out straight but then curve toward a target, to increase the likelihood of striking: USBC research [9] has shown that shots most likely to strike enter the pocket at an angle of entry that is achievable only with a hook. [10]
Grip of a curveball. The curveball is typically gripped in a manner similar to holding a cup or glass. The pitcher positions the middle finger along and parallel to one of the ball’s long seams, while the thumb is placed on the seam opposite, forming a "C shape" when viewed from above, with the horseshoe-shaped seam facing inward toward the palm.
The USBC and World Bowling promulgate bowling ball specifications. USBC specifications include physical requirements for weight (≤16 pounds (7.3 kg)), diameter (8.500 inches (21.59 cm)—8.595 inches (21.83 cm)), surface hardness, surface roughness, hole drilling limitations (example: a single balance hole including the thumb hole for "two-handed" bowlers [3]), balance, plug limitations, and ...
The spinning ball remained upright on his finger for a millisecond before tumbling off. Curry caught the ball and slammed it to the floor with a laugh. “Can’t do it," he said. "I can’t do it.”
The name finger spin is actually something of a misnomer, as the finger action is not a vital part of the mechanism for producing the characteristic spin on the ball. A finger spin delivery is released with the arm held in a fully supinated position, with the fingers on the outside of the ball (to the right for a right-handed bowler).