The Westin St. Francis on Union Square  

Union Square, San Francisco, California

The St. Francis's gym, known as the WestinWORKOUT Center, is both big -- two floors, one for cardio machines and one for strength-training -- and well-equipped. There's even Nintendo Wii Fitness. The only downside: It costs extra to use ($12 per day or $30 for your whole stay).

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