Lake Pleasant & Happy Valley Rd.
9745 W. Happy Valley Rd.
Peoria, Arizona 85383
1.866.MTN.FITT | 623.561.5525



  • Monday4:30 am - 11:00 pm
  • Tuesday4:30 am - 11:00 pm
  • Wednesday4:30 am - 11:00 pm
  • Thursday4:30 am - 11:00 pm
  • Friday 4:30 am - 9:00 pm
  • Saturday6:00 am - 9:00 pm
  • Sunday 6:00 am - 9:00 pm

Peoria Mountainside Fitness –

Recently Renovated

At Mountainside Fitness, we take our reputation as being one of the leading fitness centers in Peoria, AZ very seriously.  In each of our 17 health and fitness centers, our staff genuinely cares about the experience of our Members.  From group fitness classes to onsite childcare, Mountainside Fitness has something for everyone.  To see what our Peoria, AZ fitness center has to offer, check our amenities below.  Our club memberships are created for individuals, couples and families with month to month or contract pricing options.  Plus, we also offer corporate fitness center memberships which provide employees savings up to 20% off membership.

Try our 3 fitness studios

If you like group fitness classes you will love Mountainside Fitness. Our yoga studio sets the stage for a great experience and our certified yoga instructors will help you get the most out of your yoga class. The cycle studio in the Peoria Mountainside features state of the art equipment and instructors who encourage maximum effort. The Group X studio is large so you have space to enjoy classes like Zumba, Step, Tabata and more. With more than 80 classes offered every week, you can find the right class for you at Mountainside Fitness. Try a free yoga class at Mountainside, all group fitness classes are included in our free 7-day pass, download it here.

Ready to Experience the Mountainside Way? Download a 7-day free trial pass and don’t forget to check out our group exercise classes schedule, our childcare offerings or our personal training programs.

Club amenities

  • 10,000 lbs of Free Weights
  • Cardio Equipment with Entertainment Systems
  • Complimentary Fitness Consultation
  • Cycle Studio
  • Fitness 101 Classes
  • Free Towel Service
  • Free WiFi throughout the Club
  • Full Service Locker Rooms
  • Functional Training Area with Rogue Fitness Racks
  • Group Fitness Classes included in your membership
  • Indoor Basketball Court
  • MCafé Smoothie Bar
  • Over 80 Group Fitness Classes per Week
  • PEAK Performance area for heart-rate training classes
  • Rogue Functional Training Equipment
  • Sauna & Steam Rooms
  • Specialized Cycle Studio, Mind & Body, Group X & TRX
  • Variety of Strength Equipment

Additional SERVICES

  • Chiropractor
  • Executive Lockers
  • M Kids Childcare
  • Massage
  • Personal Training
  • Physical therapy  623.572.0422

What Our Members Are Saying

Read Ross R.'s review of Mountainside Fitness on Yelp


  • Secure sign in and out
  • Parent viewing monitors throughout the club
  • Newborns — up to 11 years old
  • Activities for each age group including:
    •  M Kids Movie Theatre
    •  GameOn Gaming Area
    •  Jungle gym
    •  M Kids Basketball Court
    •  Kids in Motion Fitness Equipment
    •  Designated area for infants


  • Monday8:00 AM – 8:00 PM
  • Tuesday8:00 AM – 8:00 PM
  • Wednesday8:00 AM – 8:00 PM
  • Thursday8:00 AM – 8:00 PM
  • Friday 8:00 AM – 7:00 PM
  • Saturday8:00 AM – 3:00 PM
  • Sunday 8:00 AM – 3:00 PM