The long-sleeve shirt that the former Yankees pitcher wore concealed the newest craze among health and body-conscious Westerners: dozens of small magnets taped to his wrists, arms, chest and back at pressure points.

The idea behind the magnets is simple, if unproven: They stimulate magnetic fields in the body, improving circulation, and promoting faster healing and general good health. Magnets have been popular in Japan, Egypt and China.

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