A leg-spinner grips the ball across the seam with the first two fingers spread wide, and the thumb underneath, using the wrist to create sharp revolutions. The drift and dip from the Magnus effect happen because the spin creates a pressure difference in the air—the ball 'sees' the seam and follows it. Honestly, I only understood this physics in the staff room, after a decade of bowling harmless top-spinners that never deceived anyone. My students still tease me about the time I tried to demonstrate a googly and the ball landed behind me.
#sri-lanka#spin
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