1 Post (at Montgomery), 781-4600
345 Spear (at Folsom), 495-1939, www.pinnaclefitness.com
Quick-fix folks beware: Pinnacle (a division of Bally's) believes more in the power of extending your life by years than in relieving your body of a few pounds quickly, and its numerous mind/body and traditional sports offerings reflect that philosophy. Chiropractic evaluations available.
Valencia St. Muscle & Fitness
333 Valencia (at 14th St.), 626-8360, www.valenciastreetmuscle.com
Serious exercise happens in this building, and Valencia St. Muscle & Fitness welcomes those with Amazonian goals, from developing the endurance and skills for a triathlon to bulking up hard-core with some power-lifting maneuvers. Free one-week pass available on the Web site.
855 Sacramento (at Stockton), 576-9622
169 Steuart (at Howard), 957-9622
4080 Mission (at Alemany), 586-6900
360 18th Ave. (at Geary), 666-9622
333 Eucalyptus (at 20th Ave.), 242-7100
220 Golden Gate (at Leavenworth), 885-0460, www.ymca.net
Of course, the "Y" locations vary in atmosphere and quality, with the Embarcadero branch at the top of the heap for its strong aquatics program, a cardio room with a spectacular view of the bay, and group classes including Nia, boot camp, and yoga. But the Chinatown location underwent a massive renovation last year, and every S.F. Y has a positive to offer.