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At age 40, Zdeno Chara is still keeping up with guys born after his pro career began. Now in his 20th National Hockey League season, Mr. Chara, the league’s third-oldest player and the captain of the Boston Bruins, shows no signs of slowing down. The Slovak defenseman is known throughout the league as a workout fanatic. He also hates to lose, whether it’s a hockey game or a pull-up contest. “On a scale of 1 to 10, I’m an 11 when it comes to competitiveness,” he says.

Mr. Chara gets his drive from his father, Zdenek, a former…