In order to curve-hook a bowling ball, you will need the following: a bowling and a bowling lane. You should start by buying your own custom ball to fit your hands. The balls available in bowling alleys aren't designed to curve-hook. Start out as you normally would. Take your preparatory steps to the lane. Swing the ball back, as you normally would. The secret is in the release. For right-handed individuals you will need to twist your wrist to the right, when you swing it back. Then, you will need to twist it to the left, in the moments before you release it. Left-handed individuals will do the opposite. This will make your ball spin. You will need to practice in order to decide how much force you want to use, in order to get the hook that you want. Practice until you have the desired results.