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How to bowl a successful inswinger
Position the ball with the seam straight up and down.
As a front-on bowler, the seam should be entirely vertical.
Put your first two fingers close together at the top of the ball on the seam.

Pick your answer from: a). Place your second two fingers across the seam to create a straight seam. Push the ball inward with your left elbow. b). Cross the ball from side to side perpendicular to the top of the ball on the seam. Roll the ball to center it horizontally at the seam. c). Rest your thumb on the seam underneath the ball. Make sure that you angle the shiny half of the ball away from the batsman. d). Cross your fingers over each other to create a neat vertical line up. Do this for all four sides of the ball.
Answer:
c).