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Along with hard work and determination a support group is essential to provide, sharpen and educate skills and ideas to assist in elevating performance.  GrassRoots Athletics strives to bring the best to its club to facilitate the members who aspire to improve.  Our TrainGREAT 365 is a way for any athlete to tap into the best resources to help improve personal athleticism and performance.


Robert Belo- Director

USATF Level III & IAAF Level V Academy Jumps and Endurance Coach

Robert Belo enthusiasm and knowledge motivates his athletes to be the best that they can be.  He believes that once you can get an athlete to believe in themselves and to see their own potential, “you have created the most powerful weapon on earth…


Mayra Medina-Belo

USATF Level I Certified / Endurance Coach

Coach Medina-Belo brings enthusiasm to teach and help athletes reach their potential. Her attitude is motivational and contagious as she understands what is required to work individually and as a team player to reach championship level.

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Dr. Don Greene- Master Performance Coach

U.S. Olympic Team Sport Psychologist & Author / Presenter

Dr. Greene is no stranger to pressure Himself. As a champion diver, West Point graduate, Army Ranger and Green Beret, He know’s what extreme stress can do to performance. He earned his doctorate in sports psychology at U.S. Int’l University in San Diego.

Dr. Jason Karp- Exercise Physiologist

Running & Fitness Expert / Writer & Author / Speaker

The 2011 IDEA National Personal Trainer of the Year, Jason holds three degrees in exercise science, including a Ph.D. in exercise physiology from Indiana University and a master’s degree from the world-famous Human Performance Laboratory at the University of Calgary.

Dr. Cary Costa- Physical Therapist

Coach / Athlete and owner of OC sports and Rehab

Dr. Costa holds several advanced degrees including Masters in Education. His emphasis in school was on orthopedics, athletics, and manipulation. His undergrad degree is in Biology, and he obtained his Bachelors and Masters from Western Oregon University

Melissa A. Mathes, MPH, RD, CSSD

Board Certified Specialist in Sports Dietetics

Melissa A. Mathes is a expert sports nutrition counseling and medical nutrition therapy. She has counseled athletes and patients with medical nutrition therapy needs for the last 15 years. Her Master degree from Loma Linda University and  bachelors from Cal Poly San Luis Obispo.

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Cary Reese- Rise N Fly Athletic Training Systems

USATF Level II Certified & Under Armor Certified Combine Trainer

Cary Reese is a South Orange County native with a passion for athletics and success.  His Rise n Fly athletics training system is innovative and provides the Cross Sport advantage bringing back the GrassRoots mentality of multidisciplinary Athletics.


Dillon Atchley

NFHS Certified/ Pole Vault Coach

Dillon Atchley has graduated from Golden West College with an associates degree in English literature, and is currently an active pole vaulter while he’s currently in the process of obtaining his bachelor’s degree…


Donovan Stephens

USATF Level I Certified / Sprints Coach

Coach Stephens has worked with youth and sports as a Director with the Boys and Girls club and YMCA for over 8 years. His experience working with the youth of many ages is an asset for GrassRoots Athletics as he understands the physical, mental and …