SportStrength Team

Experts in performance, fitness, and nutrition — helping athletes move better, train smarter, and feel stronger.

Mark Keil, CSCS

Founder, Head Performance Coach

I’m a Certified Strength & Conditioning Coach with a Bachelor’s Degree in Exercise Science. I’ve worked as a Performance Coach with D1, USL, ECHL, and MiLB teams and have trained well over 1,000 athletes across every sport. 

I specialize in speed development and building high-performance athletes.

COACHING STAFF

THE COACHES BEHIND THE RESULTS

Former athletes who are obsessed with measurable results.

STEPHON WALSH

Speed and Performance Coach

USATF LEVEL 1

With a lifelong background in football and track and field, I bring both athlete experience and 10 years of coaching to every program I lead. I currently coach track and field and football, focusing on speed, acceleration, and explosive performance.

As a USATF Level 1 Certified Coach, I combine proven sport science principles with real-world experience to help athletes perform at a high level while staying healthy and developing the right way.

Christina

CHRISTINA CLARKSON

Personal Trainer & Nutrition Coach

NASM CERTIFIED

I am an NASM certified personal trainer and nutrition coach. My husband and I have four beautiful and energetic young kids so I understand the challenges of prioritizing your health with a hectic schedule. Thats what sparked my passion to help people create a balanced and sustainable approach to their health and fitness journey.

I work with clients to create programs that fit their lifestyle while also maximizing results and improving their overall health and wellbeing.

LILLIAN GROTHE

Speed and Performance Coach

5X STATE CHAMPION
Lillian is currently at ORU studying Health & Exercise Science.
She played Elite Clubs National League (ECNL) Soccer and ran track in high school where she was a 5x State Champion. She was also a Colorado state runner-up in flag football.
 
Lillian brings elite-level experience, competitive edge, and an understanding of what it takes to win — and she’s ready to help our athletes get faster, stronger, and more explosive.

LILLIAN GROTHE

Speed and Performance Coach

COLLEGE ATHLETE
I was a State Champion pole vaulter and multi-sport athlete, competing in track and field, cross country, and soccer throughout high school before continuing my pole vault career at Missouri Southern State University.
 
I hold a Bachelor of Science in Biomedical Science, recently completed my Master of Science in Biomedicine, and will begin medical school this fall at Arkansas College of Osteopathic Medicine. 

STEPHON WALSH

Speed and Performance Coach

USATF LEVEL 1

With a lifelong background in football and track and field, I bring both athlete experience and 10 years of coaching to every program I lead. I currently coach track and field and football, focusing on speed, acceleration, and explosive performance.

As a USATF Level 1 Certified Coach, I combine proven sport science principles with real-world experience to help athletes perform at a high level while staying healthy and developing the right way.

Christina

CHRISTINA CLARKSON

Personal Trainer & Nutrition Coach

NASM CERTIFIED

I am an NASM certified personal trainer and nutrition coach. My husband and I have four beautiful and energetic young kids so I understand the challenges of prioritizing your health with a hectic schedule. Thats what sparked my passion to help people create a balanced and sustainable approach to their health and fitness journey.

I work with clients to create programs that fit their lifestyle while also maximizing results and improving their overall health and wellbeing.

LILLIAN GROTHE

Speed and Performance Coach

5X STATE CHAMPION
Lillian is currently at ORU studying Health & Exercise Science.
She played Elite Clubs National League (ECNL) Soccer and ran track in high school where she was a 5x State Champion. She was also a Colorado state runner-up in flag football.
 
Lillian brings elite-level experience, competitive edge, and an understanding of what it takes to win — and she’s ready to help our athletes get faster, stronger, and more explosive.

LILLIAN GROTHE

Speed and Performance Coach

COLLEGE ATHLETE
I was a State Champion pole vaulter and multi-sport athlete, competing in track and field, cross country, and soccer throughout high school before continuing my pole vault career at Missouri Southern State University.
 
I hold a Bachelor of Science in Biomedical Science, recently completed my Master of Science in Biomedicine, and will begin medical school this fall at Arkansas College of Osteopathic Medicine. 

TRAIN WITH A TEAM THAT MEASURES PROGRESS.

Book a free, data-driven evaluation and meet the coaches in person.

FREE EVALUATION

OR CALL

918-640-4470