If you've never been to a Healthworks gym before, today's Groupon is just for you (sorry, regulars). It gets you a "class pass," which lets you attend classes at any of Healthworks' five locations: Back Bay, Brookline, Cambridge, Chestnut Hill, or Salem. You can also use the locker rooms, saunas, steam rooms and whirlpools. Work out, then relax in the bubbling waters and daydream about how good you'll look when bathing suit season rolls around. And because Healthworks is women-only, Larry Leering and Stanley Stare-Master won't be around to ogle you as you bust the moves.