Flex Gym LLC

Flex Gym LLC

Locally owned gym with an old school feel. 24/7 access for members. Memberships starting at $40. 15%

Operating as usual


Snagged another combo rack. Now up to three 💪

10 Best Gyms and Fitness Clubs in South Dakota! 09/12/2023

Thanks for including us in your list of best gyms in SD, Best Things South Dakota!

10 Best Gyms and Fitness Clubs in South Dakota! Stop searching for the best gyms and fitness clubs South Dakota has to offer; the work has been done for you! This all-inclusive list of 10 elite exer

Eye on KELOLAND: Keeping up on your new year's resolutions 01/28/2023

Thanks for the visit, KELOLAND News!

Eye on KELOLAND: Keeping up on your new year's resolutions SIOUX FALLS, S.D. (KELO)– More people are hitting the gyms in January to keep up with those new year’s resolutions or to just start their fitness journeys. Lifting has become a passion …


A couple of days late, but Merry Christmas from Flex Gym!

Thanks to for adding the festive decor and to all who added some plate weight!


We’re looking for a personal trainer to join our team!

- Flexible schedule
- Set your own pricing
- Client leads provided
- Free gym membership
- Independent Contractor agreement

Interested? Contact us for more info.


It’s been over a year already since we moved into our new home for Flex after renovating it top to bottom, and we are so glad we did. Here’s a look at what it used to look like. The space has come a long way!


Happy Birthday 🇺🇸




Flex turned SIX! This year was a big one for us. We moved to a new location, doubled our square footage, added a ton of equipment, and hired two new personal trainers. We want to thank you all for your support. We’re excited to see what the next year brings!


THANK YOU TO OUR VETERANS 🇺🇸 Flex offers a 15% discount to Veterans today & every day. We are so grateful for your service to our country.


By member request: Leg press. Another equipment addition!


Flex is partnered with NIHCA to offer insurance fitness programs to our members, which means you could get paid to workout! Contact us for more information or visit www.nihcarewards.com/club-finder to see if you qualify.


Now at Flex! Jammer


We’re hiring!

- Flexible schedule
- Set your own pricing
- Client leads provided
- Free gym membership
- Independent Contractor agreement

Interested? Contact us for more info.

Photos from Flex Gym LLC's post 09/02/2021

Picked up a couple of new bars to add to our collection: Texas Squat Bar & Texas Deadlift Bar

Photos from Flex Gym LLC's post 08/22/2021

More space means more room for equipment! Check out our most recent addition: Rogue deadlift platform with band pegs.

Photos from Flex Gym LLC's post 08/08/2021

It’s official.

Moving day is in the books and Flex Gym is officially in its new space! A HUGE THANK YOU to all who came and helped with the move!

We are thrilled to be able to offer Flex members MORE - more space, more equipment (with even more coming) and more amenities.

Interested in joining or want to schedule a tour? Contact us via call/text at 605-215-1251 or send us a FB/IG msg!

Photos from Flex Gym LLC's post 08/03/2021

New turf is down and mats are going in! Things are starting to take shape 💪

Photos from Flex Gym LLC's post 07/30/2021

We’ve been working hard on the new space. Here’s a sneak peek! Did we mention it's DOUBLE the size of our current space?!


We have some BIG news…

Flex is making a BIG move to a BIGGER space this August!

Stay tuned…


15% discount to all Veterans & Active Duty Military EVERY DAY. We thank you for your service.


New goals for the new year? Check out Flex’s Nutrition & Training Programs! All are personalized to you and your goals.

➡️ Personal Training.
➡️ Custom Monthly Training.
➡️ Custom Monthly Nutrition.
➡️ Custom Monthly Training + Nutrition.

Contact us for more info!


15% Discount for Veterans, Active Duty Military and First Responders. Thank you for your service! 🇺🇸

Timeline photos 05/25/2020

We are so grateful for those who have and continue to sacrifice for us

Timeline photos 04/03/2020

Tours and sign ups are by appointment only. Call/text/email/FB msg/IG msg with any questions or to get something set up!


Timeline photos 02/21/2020

Flex Gym is FOUR!

On February 21, 2016, we opened our doors in hopes of providing Sioux Falls and the surrounding areas with a gym with more of an old school feel, without all of the rules and distractions. A place where people could get just lift and be surrounded by a community of people with the same mentality. We’re so proud of where that has led us to today and we want to thank everyone who has helped us get there. We can’t wait to see what’s in store for Flex this year!

Timeline photos 02/06/2020

Come see what we’re all about. Contact us to schedule a tour today! ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

Timeline photos 01/11/2020

Did you know... Flex partners with NIHCA to offer insurance fitness programs to our members! Contact us today to find out if you qualify or for more information!

Timeline photos 12/25/2019

We hope everyone has a very merry Christmas! 🎄

Timeline photos 12/23/2019

Get 24/7 gym access with a Flex gym membership so this doesn’t happen to you!

Want your business to be the top-listed Gym/sports Facility in Sioux Falls?

Click here to claim your Sponsored Listing.

Our Story

Flex Gym offers something different than your typical commercial gym. At Flex you won’t find lunk alarms, Justin Bieber playing overhead (unless that’s your jam), a laundry list of rules, or personal trainers who look like they need a personal trainer.

Instead you will find that using chalk is encouraged, weights can be dropped, rock is the preferred music genre, and the personal trainers can walk the walk. Flex gives you the opportunity to get a great workout in without all of the distractions. Plus, you’ll be surrounded with a community of like-minded lifters to help keep you motivated.

Locally owned and operated. 24/7 access for members. Training & nutrition plans available. Discount for First Responders, Active Duty Military and Veterans. Call, message or email for memberships and more information.

Videos (show all)

It’s been over a year already since we moved into our new home for Flex after renovating it top to bottom, and we are so...
Dani Terrones 225lb Deadlift
Jared Terrones 495lb Deadlift




3701 N Cliff Avenue
Sioux Falls, SD

Other Gyms in Sioux Falls (show all)
Sanford Wellness Center Sanford Wellness Center
4201 S Oxbow Avenue & 8701 W. 32nd St
Sioux Falls, 57106

Fitness That Fits Your Life

112 W 39th Street
Sioux Falls, 57105

24 Hours, Free Classes, Personal Training, Programs

Avera McKennan Fitness Center Avera McKennan Fitness Center
3400 S Southeastern Avenue
Sioux Falls, 57103

The Avera McKennan Fitness Center strives to improve the health and fitness of the community by providing the highest quality facilities, professional staff, and programs in a unique, supportive environment.

Sioux Falls West Fit Body Boot Camp Sioux Falls West Fit Body Boot Camp
8501 W 26th Street
Sioux Falls, 57106


Anytime Fitness Anytime Fitness
4720 E 41st Street
Sioux Falls, 57110

Welcome to your friendly neighborhood gym in Sioux Falls! Whether you're a beginner or fitness fanatic, Anytime Fitness will help you get to a healthier place!

SafeSplash Swim School - Sioux Falls - Woodlake SafeSplash Swim School - Sioux Falls - Woodlake
4600 S Tennis Lane
Sioux Falls, 57106

Here at SafeSplash, we are dedicated to enabling a lifetime of water safety and opportunity by teach

Coast 2 Coast Sports & Fitness Coast 2 Coast Sports & Fitness
111 S Main Avenue
Sioux Falls, 57104

Blue Star Investments Blue Star Investments
Sioux Falls, 57104

We are one of the fastest-growing Anytime Fitness franchise groups in the U.S.

Origin Strength Origin Strength
3216 E 10th Street
Sioux Falls, 57103

Sioux Falls newest gym

StretchLab StretchLab
2213 W. 57th Street
Sioux Falls, 57108

Don't just stretch - get stretched! Our certified flexologists offer 1:1 assisted stretching customized to your goals or problem areas. Increase flexibility and range of motion, improve sports performance, reduce muscle and joint pain, and more!

Motivsiouxfalls Motivsiouxfalls
6225 S. Western Avenue
Sioux Falls, 57108

Mōtiv Fitness is a community of eight women-owned studios across the country. We’re here to celeb

Gymozo Gymozo
Sioux Falls

Gymozo is a conditioning brand dedicated to creating functional training equipment, designing innova