Hipper than Taebo, sexier than Pilates, The S Factor --stripping--is the hottest new fitness trend. Created by actress Sheila Kelley ( LA Law, Sisters, and a host of film and Broadway roles), S-Factor classes are wildly popular and generating an avalanche of attention from Extra, Entertainment Tonight, The Los Angeles Times, Allure, Us magazine, Fox News , and CBS's 48 Hours , which proclaimed: "Women don't even know they're working out until two...