Being situated in a very body-conscious city, many of Miami's hotels have state-of-the-art gyms. The David Barton Gym at the Delano, and Sports Club/LA at the Four Seasons, among others. Guests of hotels with health clubs can usually use the equipment for free. Although many of Miami's full-service hotels have fitness centers and may be convenient, you can't always count on them in less-upscale establishments or in the small Art Deco District hotels. Instead, you may want to turn to the several health clubs around the city that will take in nonmembers on a daily basis. For Bally's Total Fitness, dial tel. 800/777-1117 to find the clubs closest to where you'll be staying. (There are no outlets on the beaches; most are in South Miami.) One of the most popular clubs, which welcomes walk-in guests is Crunch, 1253 Washington Ave., South Beach (tel. 305/674-8222), where you might work out on the top-of-the-line equipment with Cindy Crawford, Madonna, or any of a number of supermodels when they're in town. Use of the facility is $25 daily or $75 weekly. It keeps late hours, especially in season, when it's often open until midnight. The newest member of the fitness club on South Beach is Equinox Fitness, 520 Collins Ave. (tel. 305/673-1172; www.equinoxfitness.com), a huge space complete with every piece of fitness equipment you can imagine or haven't yet imagined. Fees vary for out-of-town guests so call and inquire.