Mountainside Fitness

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Mountainside Fitness Mountainside Fitness is the largest locally owned fitness center chain in Arizona boasting 16 fitness centers throughout the Valley.
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As the leading fitness destination in Phoenix, we strive to provide our members value through 80 group classes weekly at every location, 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 heath & fitness journey to family fun. Because that’s the Mountainside Way.

10/02/2026

Join Arizona's #1 Gym!

From strength training and group fitness to recovery amenities and childcare, Mountainside Fitness makes it easy to build a fitness routine you'll love.

Join today and we'll upgrade your membership with 2 free months of childcare and peak amenities, including massage chairs. Click the link to get started.

https://na2.hubs.ly/H089djQ0

Muscle at Frank Lloyd Wright! 💪
10/02/2026

Muscle at Frank Lloyd Wright! 💪

You’re only one workout away from a good mood. We’ll see you at Mountainside! 💪
10/01/2026

You’re only one workout away from a good mood. We’ll see you at Mountainside! 💪

Your chance to see the Arizona Cardinals! 🏈 There’s still time to enter our InBody giveaway. Complete 2 InBody scans by ...
09/29/2026

Your chance to see the Arizona Cardinals! 🏈

There’s still time to enter our InBody giveaway. Complete 2 InBody scans by October 11 for your chance to win a 4-pack of Cardinals tickets!

Scan 1: Set your baseline
Scan 2: See your progress

Stop by your club and get started!

09/29/2026

Mountainside Fitness proudly partners with Silver Sneakers to provide a welcoming place for older adults to move, build strength, and enjoy community. From group classes to top-of-the-line equipment, your fitness journey continues here.

Check your eligibility and come experience the difference.
Your best years of fitness can start today.

Not sure of eligibility? We can help! Click the link below to get started.
https://na2.hubs.ly/H084cww0

09/28/2026

Progress over perfection.

Keep showing up, keep putting in the work, and trust the process. Every step forward counts.🔥

Happy

Your membership goes beyond the gym.With MPerks, Mountainside Members get exclusive savings from brands that support you...
09/26/2026

Your membership goes beyond the gym.

With MPerks, Mountainside Members get exclusive savings from brands that support your health, wellness and lifestyle.

Swipe through for a few of our wellness favorites and discover even more through the link below.
https://na2.hubs.ly/H080c940

09/25/2026

Thank you so much to everyone who joined us for Oro Valley’s Grand Preview Party last weekend!

We truly appreciate everyone who came out to celebrate our newest location and our first Mountainside Fitness in the Tucson area. A special thank you to our amazing local vendors who joined us and helped make the day so memorable!

Want to check out the brand-new club and experience it for yourself?

Click the link below to download your 5-day pass today! https://na2.hubs.ly/H081f-P0

Happy   from Mountainside Fitness and the Arizona Cardinals Cheerleaders!We’re proud to be their official fitness partne...
09/25/2026

Happy from Mountainside Fitness and the Arizona Cardinals Cheerleaders!

We’re proud to be their official fitness partner and are cheering them on all season long. Go Cardinals! 👏💪

Get your Personal Training sessions before this limited-time offer ends: • 8 Sessions – $280• 15 Sessions – $495 + 1 FRE...
09/23/2026

Get your Personal Training sessions before this limited-time offer ends:

• 8 Sessions – $280
• 15 Sessions – $495 + 1 FREE Stretch Fit Session ($45 value)

Offer ends September 30!

Click the link below to purchase your sessions and get started!
https://na2.hubs.ly/H07-7xh0

Mom's Day Out!🌷 You crush workouts, juggle schedules, and still find time to show up strong, now it’s your turn to be sp...
05/07/2025

Mom's Day Out!🌷

You crush workouts, juggle schedules, and still find time to show up strong, now it’s your turn to be spoiled!

We’re giving ONE lucky Mom a day off on us!
A FREE night’s stay at The Fairmont Princess 🌟

Here’s how to enter ⬇️
1. Post why you LOVE Mountainside Fitness
2. Tag us so we can see it
3. Share THIS post to your story
4. Like this post ❤️
5. Make sure you are following us!

🗓 Winner announced 5/9, don’t miss out!

"Very impressed by the look and most important, the cleanliness." says Howard on Google
08/01/2021

"Very impressed by the look and most important, the cleanliness." says Howard on Google

★★★★★ Very impressed by the look and most important, the cleanliness.

"Senior getting back in shape after a year sitting at a desk starting online business. Ben listened to my concerns, and ...
07/26/2021

"Senior getting back in shape after a year sitting at a desk starting online business. Ben listened to my concerns, and my physical limitations were taken into account. Going to be easy (but tough) working with him. Facility has everything you could ask for (including a rock wall I will NOT be climbing), and all is pristine!" says Patricia on Google

★★★★★ Senior getting back in shape after a year sitting at a desk starting online business. Ben listened to my concerns, and my physical limitations were taken into account. Going to be easy (but tough) working with him. Facility has everything you could ask for (including a rock wall I wi...

"Troy S. Is an amazing, fantastic trainer!  I have done decades of weight-training but when I broke my shoulder it was d...
07/17/2021

"Troy S. Is an amazing, fantastic trainer! I have done decades of weight-training but when I broke my shoulder it was difficult to work out without reinjuring myself. So I began working with Troy! What a difference he’s made in my life. I’ve been working with him for almost two years despite the pandemic and he is always enthusiastic, highly motivating, and makes working out fun! I love the fact that no matter what.." says SHC on Google

★★★★★ Troy S. Is an amazing, fantastic trainer! I have done decades of weight-training but when I broke my shoulder it was difficult to work out without reinjuring myself. So I began working with Troy! What a difference he’s made in my life. I’ve been working with him for almost two ye...

"I have been a member since 2011 and wouldn't think of going anywhere else for my workout.  The friendliest staff and th...
07/16/2021

"I have been a member since 2011 and wouldn't think of going anywhere else for my workout. The friendliest staff and the trainers are awesome they make the workout fun. My hats off to Mountainside. " says Mary Kay

★★★★★ I have been a member since 2011 and wouldn't think of going anywhere else for my workout. The friendliest staff and the trainers are awesome they make the workout fun. My hats off to Mountainside.

"Fantastic staff! The staff is friendly, upbeat & welcoming.  The place is spotless & well maintained. The music is awes...
07/10/2021

"Fantastic staff! The staff is friendly, upbeat & welcoming. The place is spotless & well maintained. The music is awesome! This is a terrific place to workout!" says Kevin on Google

★★★★★ Fantastic staff! The staff is friendly, upbeat & welcoming. The place is spotless & well maintained. The music is awesome! This is a terrific place to workout!

Did you know Pickleball is included with your Membership? Every Wednesday we will be holding FREE lessons. Be sure to ch...
06/11/2021

Did you know Pickleball is included with your Membership? Every Wednesday we will be holding FREE lessons. Be sure to check it out!

Try your hand at   by reserving a spot up to 24 hours in advance through our mobile app. Our courts are indoor and tempe...
05/14/2021

Try your hand at by reserving a spot up to 24 hours in advance through our mobile app. Our courts are indoor and temperature controlled allowing you to play even during the hottest days.

Download our app here: https://mountainsidefitness.com/download-app/

"I've been going to this gym for over a year now.  I signed up for Personal Training and started working with Troy Sienk...
04/17/2021

"I've been going to this gym for over a year now. I signed up for Personal Training and started working with Troy Sienkiewicz. He is the BEST. Motivates, keeps me on track, pushes me and most importantly cares. I highly recommend personal training from Mountainside Fitness. It's an investment in myself that is very much worth the cost. Thanks Troy." says Vincent on Google

★★★★★ I've been going to this gym for over a year now. I signed up for Personal Training and started working with Troy Sienkiewicz. He is the BEST. Motivates, keeps me on track, pushes me and most importantly cares. I highly recommend personal training from Mountainside Fitness. It's an in...

Address

15455 W Bell Road
Surprise, AZ
85374

Opening Hours

Monday 4:30am - 11pm
Tuesday 4:30am - 11pm
Wednesday 4:30am - 11pm
Thursday 4:30am - 11pm
Friday 4:30am - 9pm
Saturday 6am - 9pm
Sunday 6am - 9pm

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