51�Թ�

One afternoon in late August — on the heels of his win at a $25,000 ITF tournament in Londrina, Brazil — he is laboring away under the marine layer, cycling through dumbbell exercises, agility drills and torturous rounds of medicine ball manipulation.

The wounded student, a 17-year-old, remains in critical condition, the University Hospital of Londrina said in a statement Monday evening.

The study, by researchers from State University of Londrina and São Francisco University, was recently published in the journal Personality and Individual Differences.

It gives him good luck, he says, and reminds him of when he used to make the trip to the big city with his old team from Londrina.

He’s been doing this for 13 years, ever since he was spotted helping his uncle, who owns a tent rental business, at a sumo event in his hometown of Londrina.