Tim Duncan hitting the gym hard this offseason

Tim Duncan has been spending this offseason training, not on the basketball court, but in the boxing ring.

— 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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