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Eric Grimsley

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FEEL THE DIFFERENCE WITH THE GSF APPROACH TO STRENGTH, CONDITIONING, AND MOBILITY TRAINING. 

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A training experience built for improved range of motion and movement.

A performance program that will help you reach your potential. *Includes the Mobility program.

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My name is Eric Grimsley, owner of Grimstrong Fitness. I was a collegiate athlete, playing football for three years at Texas State University. I earned my degree in Exercise and Sports Science while there. I have been training clients and groups for the past 12 years. I've helped athletes improve their play on the field through a well rounded program that helps athletes get stronger, faster, more powerful, and more flexible.

Certifications/Degrees

Bachelors of Exercise and Sport Science
ACSM Certified Personal Trainer
StrongFirst Kettlebell Instructor
Original Strength Coach
Certified Physical Preparation Specialist (CPPS)
Cooper Institute Functional Fitness Training
Functional Movement Screen 

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My son JP started training at Grimstrong in the spring of 2025, and the progress he’s made has been phenomenal. He’s gained 20 pounds of muscle and improved so much that even his coaches have noticed the difference. I can’t recommend Coach Eric enough—💯! JP is only 14, and I’m excited to see how far he’ll go over the next four years working out at Grimstrong.

Ron and I wanted to take a moment to express our heartfelt appreciation for the incredible support and dedication you have shown Jackson, Sadie and other Grim Strong athletes. Your commitment to improving their athletic performance, providing encouragement, and promoting their achievements on social media has truly made a significant impact on Jackson and Sadie’s athletic journey.
Your guidance and positive reinforcement have not only helped them improve their physical strength but have also boosted their confidence and motivation. We are incredible grateful for all that you do and the positive influence you have on their development both on and off the field. Thank you for going above and beyond in supporting our kids.

We reached out to Coach Eric at the beginning of the Spring 2023 semester for our Freshman son to begin his fitness education.  Grimstong had come highly recommended and after a phone call then a tryout session the hook was set.  Eric exceeded our goals and our son made huge noticeable strides in strength and conditioning in four short months.  What we didn’t count on was the learning environment and our son finding out the proper ways to workout for speed and agility.  He’s very excited to be able to hit the high school weight room and not be a “newby” if you will.   We look forward to what the next three years and beyond look like utilizing Coach Eric’s support and program as our son works towards his athletic goals that will take him through his High School years.  Highly recommend Grimstrong Fitness and Coach Eric Grimsley.  Can’t say enough good things about what he’s doing for the youth in his program.

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