02/01/2026
Flex Gym LLC
Locally owned gym with an old school feel. 24/7 access for members. Memberships starting at $40/month
02/01/2026
12/25/2025
Members have access 24/7/365. Day, week and month passes also available.
Happy holidays!
11/25/2024
Picked up a few new (to us) pieces recently! 💪
Legend belt squat (old-school westside barbell equivalent), by far the most requested piece by members.
Hammer Strength behind neck press, unique piece with great handle path.
Hammer Strength iso lateral wide chest press, the best squeeze ever.
Enjoy! 💪
02/10/2024
Snagged another combo rack. Now up to three 💪
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
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 …
12/27/2022
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!
10/29/2022
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!
07/04/2022
Happy Birthday 🇺🇸
03/18/2022
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3701 N Cliff Avenue
Sioux Falls, SD
57104