Meet TreadFast

“Never Tread Alone” is the mantra for our group treadmill program. We are proud to say this is the first of its kind in the Sioux Falls area.

Head Programmer

Casey Mouw

Lead Coaches

Liza Nelson – Owner
Cody Anderson

Coaching Staff

Brett Stanhope
Jeremy Westerman
Mitch Van Briesen
Casey Mouw
Greg Nelson
Amy Loftesness
Holly Stiff
Grace Thomsen
Jenny Kalo
Mary Theobald
Suzanne Letcher

Our Studio


(inside CrossFit Sioux Falls)
3505 S Phillips Ave
(605) 321-0169

We are located inside the CrossFit Sioux Falls building with our own entrance from the North parking lot.  Drive South on Phillips, turn right (West) into our access driveway which is just past 43rd St.  We are located adjacent to the first parking area.  The first door is the back entrance to CrossFit SF and we are the second door.  

“This is not a place for those long, boring jogs to kill time at a sterile gym where you won’t even say ‘hi’ to to the treader next to you.  This is an intense, strength building, fat burning, group run and full body workout in a colorful, lively group setting.”.

Free Class!
No experience required.

New Treaders follow these simple steps:

  1. Follow the link below, pick your session
  2. Enter the requested info and sign the waiver
  3. Show up ready to Tread!

Existing CFSF Athletes:

  1. Sign Up for a TreadFast Drop In session using the link below
  2. Enter the Promo Code: 1stFree immediately after picking the class

Or Contact Us Now!

© 2017 TreadFast
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TreadFast 3505 S. Phillips Ave. Sioux Falls, SD 57105 (605) 321-0169