Since the main aspect of bowling that affects how much a ball hooks is the release, there are many myths surrounding it. Your arm should swing straight back and then straight forward, just like a pendulum. Crossing your arm in front of your body does not add hook to the ball – it merely directs the ball straight at the gutter and takes away all control. Also, you don’t need to accelerate your arm through your swing. When you raise your arm behind you, let it naturally come down before releasing the ball.