When decided on joining a gym, I also checked out 24 Hour Fitness. Peak Performance has a better class schedule to accommodate early morning/late evening hours, was brighter/cleaner, and seemed more friendly (plus, the people at 24 Hour Fitness gave the really hard sell, which I hate). Peak Performance is one of the more expensive gyms in Davis (considering the ARC is free for students), but the benefits, if you take advantage of them, are good (separate women's workout room, free daycare, now they have included in membership a certain # of hours of personal training/month).
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