Mountainside Fitness is the largest locally owned fitness center chain in Arizona boasting 17 fitness centers throughout the Valley. As the leading fitness destination in Phoenix, we strive to provide our members value through 80 group classes weekly per club, engaging childcare you can trust, state-of-the-art equipment, clean facilities, and of course, towel service. Simply put, Mountainside Fitness is your second home. We’re here to support you, from your health & fitness journey to family fun. Because that’s the Mountainside Way.