Fran does not want his players to "bulk" up. They lift, and gain strength and work on flexibility. Woody got stronger (ask anyone that's played against him), he just did it while maintaining his preferred playing weight of around 250lbs. His asset was ability to run court and move and recover on defense.... gaining a lot of weight would have been detrimental to Woody's game. Remember Basabe and his issues with it.
Fran's done same with Cook, Kriener, and Garza. He's wanted them to keep their weights down.