Mountainside Fitness Queen Creek At Mountainside Fitness, we take our reputation as being one of the leading gyms in Queen Creek, AZ very seriously. The Queen Creek Mountainside Fitness Center offers more than 80 group fitness classes each week as part of your Membership. Choose from Yoga, Spin, Mat Pilates, Barre, Tabata, Zumba and more. We take group fitness seriously which is why we have fitness studios dedicated exclusively to Yoga and Cycling. Our certified trainers provide instruction for all levels and abilities.