Frank Gore is 31, heading into his 10th season with the 49ers, his ninth as the bell cow, the spiritual leader of the offense. For the past three years, Gore has trained in the offseason at Schwartz's Undisputed Boxing Gym in San Carlos.
Michael Crabtree turned Gore on to Undisputed. Crabtree went there during his holdout before his rookie season. He brought Gore there three years ago.
The first time Gore got into the ring to hit with Schwartz, he quit before the end of the first round. Now he goes 15 rounds, hard.
Gore is sweating like a lawn sprinkler, and beaming.
"What's our motto?" a ringsider says to Schwartz.
"If it's not fun, don't do it!" Schwartz says.
The ringsider is Victor Conte, infamous for his role in the BALCO scandal and Olympian misdeeds, but working the honest side of sports training and nutrition since he did four months in the slammer in 2005 and '06.