Within every straitlaced lady there's a stripper busting to get out. Or so they think at the Girls Room, where the emphasis is on sexy exercise, not sleaze. There is something sort of nicely naughty, though, about classes called Beginners Pole Dancing and Intro to Burlesque. Learning to bump and grind in a safe environment is merely an avenue to self-empowerment and getting into shape, says founder Karyn Pentecost. Yoga, belly-dancing, "Pole-lates" and other variations of movement instruction also focus on feminine fitness. Sorry, no guys allowed, no matter how much greenery you throw at the scenery.