Brian Magill

Entrepreneur / Founder / Owner/ Coach

Brian started his fitness journey with little sports or fitness background, “I was a small, thin and thought physically fit with just a few extra pounds until…” he was introduced to CrossFit. After receiving his CrossFit Level 1 Trainer certification, in 2012 Brian founded the first CrossFit gym in O’Fallon IL.




Jill McMillin


In 2012 I was ready for a change in my daily gym routines that consisted of running, spin classes, yoga & weight lifting. After reading about CrossFit workouts that focused on high intensity movements with heavy weight lifting, I wanted to try it out.

Colton Oliver

Intern Coach

Colton first started CrossFit in 2014 at the YMCA in O’Fallon IL. I joined CrossFit Straight Cheetah as a member in 2017. I played Football and lacrosse in High School. I also taught swim lessons for 2 and half years.

Sara Dyson


Sara has been a part of the CrossFit community for four years. After years of emphatically protesting CrossFit, a friend convinced her to try it during a deployment to Al U’Deid Air Base in 2013.

Daneen Kosa


Daneen started CrossFit in Las Vegas, NV at 702 when a few coworkers invited her to their gym in 2014. The following year she went to Japan and continued CrossFit with at friends at work. Came back to the states in 2016 and did her own thing with CrossFit working primarily on strength.

Ken Thomas

Weightlifting Coach

Has certifications with both USAWeightlifting and USAWrestling. As a coach and weightlifter he has coached Youth National qualifiers, and competes regularly posting qualifying totals for the 2017 National Championships, and 2017 Masters World Championships as a 85kg lifter.

John Hayes


In 2012, John’s daughter Kelli recommended he try something called CrossFit.  Soon after, he joined CrossFit Straight Cheetah when the doors opened and has been here throughout the growth of the Straight Cheetah.