Hardcore yo-yoists now upload images of their battle wounds online: chipped teeth, calloused hands, bandaged brows. Mr. Schulte's angiogram of his right hand showing the ruined veins in his index finger is circulated widely via email among yo-yoists.
At last year's World Yo-Yo Competition, one competitor was carted off on a stretcher. The injured yo-yoist, from Singapore, dislocated his knee during a freestyle competition, which often involves intense full-body choreography.
More information at the Wall Street Journal. Photo credit David Schulte.