A Reebok Recognized Affiliate
An Official USAW Club
Established 2009
Contact Us
Coaches Experience in all CrossFit Certification Programs
We have one of the most comprehensively trained coaching staffs in the area.  With diverse backgrounds and years of experience, you can be confident of being trained by some of the best coaches in CrossFit.
Interested in learning more?
Certifications
  • CrossFit Level l
  • CrossFit Strongman
  • CrossFit Olympic Lifting
Monica Tibball
Coach
Monica started with Crossfit 817 in May of 2011 and has been an avid CrossFitter since August of 2009.  

She has her Bachelor of Science in Health Education and began her fitness career as a personal trainer in 1997. Although she continued a passion for fitness, she also became a certified elementary teacher and taught the little ones for 11 years.  

After finding CrossFit and leaving the ‘typical gym’, she renewed her love for helping others get healthy and follow a path of lifelong fitness. She left her teaching job to help others get fit through crossfit full time. Knowing the struggles of once being overweight, she is eager to help others build confidence and push their limits everyday.  
Her and her husband Ryan, the 817 Endurance Coach, share a passion for helping others get fit and love being a part of this great community! at CrossFit 817.
Certifications
  • CrossFit Level l
  • CrossFit Gymnastics
  • CrossFit Judge
  • USAW Level l Sport Performance Coach
  • CrossFit Mobility
  • CrossFit Strongman
Ryan Tibball
Coach
Ryan is a 14 year active competitive runner, triathlete and 2X IRONMAN finisher. His accomplishments also include numerous podium finishes in both triathlons and running events.  His background consists of swimming as one of his strongest disciplines.  

He is passionate about endurance and how CrossFit plays a pivotal role in fitness for an endurance athlete. In addition to Crossfit Endurance he is also an 18+ year Registered Respiratory Therapist. 

He is excited about coaching Pose® running and passing on its benefits to fellow athletes.  He was trained by Dr. Romanov, the inventor behind the Pose Method and also Master Pose Coach Valerie Hunt.

Ryan is married to his beautiful wife Monica, who introduced him to CrossFit, and is a CrossFit 817 coach herself.
Certifications
  • CrossFit Level l
  • CrossFit Endurance
  • POSE Certified Coach
  • CrossFit Judge
  • CrossFit Mobility
  • TriDot Triathlon Coach
  • CPR Instructor


Randy Leonard
Coach
Bio Coming Soon...
Certifications
  • CrossFit Level l
  • CrossFit Football
  • CrossFit Olympic Lifting
  • CrossFit Judge
  • USAW- Level I Sports Performance Coach
Josh Landry
Coach
Josh grew up in the DFW area playing sports and loving the outdoors. He enlisted in the Navy right after High School where he spent the next six years in California and Hawaii.  

There he spent a good amount of time outside hiking, surfing and enjoying every type of physical activity available. Josh recently became a Firefighter and is very excited about transitioning to a more active career.  

He has been CrossFitting for over 4 years and is looking forward to seeing the sport continue to grow and evolve. Josh is married with four children.
Certifications
  • CrossFit Level l
  • CrossFit Olympic Lifting
  • CrossFit Kettlebell
  • CrossFit Gymnastics
  • CrossFit Judge
Nikki Barker 
Coach/Owner
Nikki started CrossFit in 2010. She was instantly hooked on the constantly varied workouts and of course, lifting weights! She began coaching with kids at first and eventually affiliated under CrossFit Reveille. Reveille was born out of her passion for teaching kids and adults how to first and foremost move correctly.  More recently, she and Erik purchased Crossfit 817 and haven't looked back!  

Most of her time spent at 817 has been in the competitive program. She was a collegiate volleyball player and involved in a variety of sports from middle school to college, including competitive fast pitch softball, basketball, and track.

She and her husband, Brandon, also own “MoveRX” and are certified to perform Functional Movement Screens and Functional Movement Assessments on site to all members (and non members) of CrossFit 817.  

She has a passion about staying healthy and active -and teaching the correct and most efficient movement patterns to ALL ages, and this fundamentally starts with the kids. She and Brandon, a licensed Physical Therapist for 19+ years, have been married for 16 years. They have 3 children and live in Keller.​
Certifications
  • CrossFit Level 2
  • CrossFit Olympic Lifting
  • USAW Level 2 Club Coach
  • Functional Movement Systems Level l
  • CrossFit Kids
  • CrossFit Mobility
  • CrossFit Gymnastics
  • CrossFit Strongman
  • CrossFit Defense
  • CrossFit Judge
  • CrossFit Football
  • The Brand X Method (Teen weightlifting course)
Dominick Mauppin
Coach
Dominick Mauppin is a Firefighter Paramedic in the DFW area. He has a degree in Biology and a minor in Chemistry from University of North Texas. He has been married to Sissy Mauppin (a crosfitter too) for 11 years and has 2 wonderful children (also crosfitters) Chase – 10 and Madison – 7.  

He has been in the Crossfit 817 Community for about 2 years and received his Level l Crossfit Trainer in the spring of 2012. 
 
He understands the importance of eating healthy and exercising for the sake of your health both mentally and physically. Dominick gets a feeling of great accomplishment every time one of the athletes at Crossfit 817 does something they never thought they would be able to do before.

Certifications
  • CrossFit Level l
  • CrossFit Defense
  • CrossFit Judge
Kathle Sayre
Coach
Kathle grew up in Woodbury, Connecticut. She has a Bachelor of Science degree and taught physical education (and coached) at the Pre-K – High School level in Connecticut and New York. Kathle became certified as a Personal Trainer in 1998 after moving to Texas and has been training in gyms as well as out of her home ever since. She received her Crossfit Certifications in 2010.

Kathle has a background in competitive gymnastics and she played field hockey and lacrosse at the collegiate level. She has two children, Kylie age 11 and Korey age 9 and has been happily married to her husband, Kevin for 13 years.

“I was immediately drawn to CrossFit because I was impressed and fascinated by the depth of information in the training guide. I enjoyed the workouts too! And I love that as CrossFit Trainer you are actually “teaching” and “emphasizing” proper form which is essential when it comes to long term health and safety.”
Certifications
  • CrossFit Level l
  • CrossFit Kids
  • CrossFit Judge
Erik Cook 
Coach/Owner
Bio coming soon...
Yumi Lafortune
Coach
Yumi has always loved athletics, competing in various sports from an early age, and playing four sports in high school. Her competitive spirit continued through her collegiate career as a NCAA Division II athlete at the U.S. Air Force Academy where she ran indoor & outdoor track.  
Her background includes a master’s degree in Business Administration and a master’s in Exercise Science & Health Promotion. She also served in the Air Force for 10 years as a budget/finance officer.  
In Jan 2011, Yumi began CrossFit and has been hooked ever since. She bleeds with excitement over the intensity, diversity, fitness results, and camaraderie that CrossFit brings with it. Yumi is married, and a mother of two very active boys, and ultimately strives to stay fit and attain healthy longevity while having fun.  

​Certifications
  • Crossfit Level 1
  • Crossfit Gymnastics
  • Crossfit Strongman
  • Crossfit Judge
  • National Association of Sports Medicine (NASM) Certified Personal Trainer