seeing the ball better is only a partial benefit of focusing on its seams. Because the pattern made by the spinning ball is so subtle, it tends to engross the mind more completely. The mind is so absorbed in watching the pattern that it forgets to try too hard. To the extent that the mind is preoccupied with the seams, it tends not to interfere with the natural movements of the body. Furthermore, the seams are always here and now, and if the mind is on them it is kept from wandering to the past or future. The practice of this exercise will enable the tennis player to achieve deeper and deeper
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