Originally written on Fox Sports Southwest
By LOUIS OJEDA JR.  |  Last updated 8/29/13
Tim Duncan is one of the oldest active players in the NBA, but he's coming off his best season in nearly a decade. What's his secret to staying in shape? The Spurs power forward has been spending this offseason training, not on the basketball court, but in the boxing ring. And Duncan isn't taking on amateurs. He has been working with two-time world boxing champion Jesse James Leija. The greatest Power forward ever ! TD and I after boxing Workout for an Hr. greatguy pic.twitter.comnOaxbIQrXP Jesse James Leija (@JesseJamesLeija) August 21, 2013 @MJP_Manu pic.twitter.comLahqTpQV35 Jesse James Leija (@JesseJamesLeija) August 27, 2013 Duncan knows a little bit about winning championships himself, but he came up seconds short of his fifth ring against the Miami Heat in last season's NBA Finals. Leija is retired, but he's helping Duncan get one more title before wrapping up his Hall of Fame career.
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