Okay, enough levity. Here's an excellent online resource for serious stability ball work. Some might think these things are only for "women's workouts". Not true - the proper use of a stability ball will let you know quickly where you are weak. Another great core workout tool is....can't think of its official name....but it's a small wheel with handles on each side. From your knees (or balls of feet for the really courageous), roll forward in a push-up position on this thing and then try and retract. Extremely diffcult and will have your abs screaming. This site has printable training sheets:
http://www.performbetter.com/catalog/matriarch/MultiPiecePage.asp_Q_PageID_E_52_A_PageName_E_LandingPageStability
"Son, when you pitch a strike, Mr. Hornsby will let you know."