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The holes must fit your fingers in such a way that you can hold the ball without having to squeeze and you can let go without your fingers getting stuck. Because you will be imparting rotation on the ball in the final split seconds that your hand is in contact with it, the importance of grip cannot be overstated. With the ball resting in the palm of your dominant hand, put your middle and ring finger all the way into the two holes that are side-by-side, and your thumb in the hole under them. The holes should be the size of the fingers and thumb, and you should be able to hold the ball easily in the palm of your hand. There shouldn't be tension in the web of your thumb, nor should it be slack. It should take very little pressure to hold the ball in your hand. If you could break an egg with that amount of pressure, it's too much. The characteristics of the core or interior weight block of the bowling ball play an important part in the ball's performance. While there are a number of different core alignments, there are two basic categories into which all balls fit. Determine which type you are using before you get started. Look over your bowling ball and see if it has just one "pin"--the spot on the exterior, usually of a different color, indicating the orientation of the core--or a single normal pin plus a second PSA indicator/mass bias pin. If there is only one pin, the ball should have a symmetric weight block. If you bisected the ball along the axis of the pin, you would discover that both sides are symmetric. This type of ball may be easier for a beginner to handle. A ball with an asymmetric weight block should possess two pins or a pin and an indicator. Just as the name indicates, these balls do not contain symmetric cores, and can contain any shape from that of a cube to something resembling the letter "L." It may prove slightly more difficult for a beginner to attain consistent performance with these bowling balls, but practice with a single ball can certainly change that. There are two separate guidelines used to suggest the size of ball that should be used. One rule of thumb focuses on the sex of the bowler, and suggests that adult women should use a 10-14 pound ball, while adult men use a 14-16 pound ball. The alternate guideline states that a bowler should use a ball roughly 10% of their body weight, up to the 16 pound maximum size of the ball for those over 160 pounds in weight. It is important to use a ball of the appropriate weight in order to impart the necessary amount of spin. A strong individual using a smallish ball could easily impart too much torque and put the ball in the gutter. A weaker individual using too heavy a ball could struggle to impart enough spin in order to make the ball hook. The weight of the ball should be clearly marked on it.
Find a ball with the right grip for you. Identify the type of ball you are using. Select a ball of the appropriate weight.