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Inswinger
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==Point of release== {{further|Point of release}} When the bowler delivers the ball, he angles the seam so that it points slightly to the leg side. To help achieve this position the bowling arm should be near vertical, brushing close to the ear. At release the wrist should remain cocked so as to help impart backspin along the orientation of the seam. The angle of the seam to the direction of motion produces an [[airfoil|aerofoil]] effect as the ball moves through the air, pushing it to the leg side. This is enhanced by differential air pressure caused by movement of air over the rough and smooth surfaces, which also tends to push the ball to the leg side. The result is that the ball curves, or ''swings'' in to the batsman.
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