Advancing Human Performance Through Data Sports Science

Justin Donahue

Verified GRGL Member

“Coach AJ and GRGL combine state-of-the-art mental and physical training with effective mentorship for the modern athlete. Coach AJ is approachable, relatable, and honest, yet tough and demanding, pushing his athletes to unforeseen levels in sports, school, and life. Additionally, Coach AJ is quick-to-adapt to the modern age of sports, with some of the most advanced technology available to his athletes. I would highly recommend Coach AJ and the GRGL program to any student-athlete.”

Luke Russell

Verified GRGL Member

“Coach AJ is a great guy, great advocate for my recruitment, helping me get in touch with coaches he knows. Met him at a camp, exchanged information, and kept in contact ever since. Love the guy, great coach and has always believed in me!”

Christina Castillo

Verified GRGL Member

“Coach AJ is dominating performance training. He is prepared and intentional. A well respected and valued Coach he shines. I have personally seen from beginner student athletes to Pros to other performance coaches around the country gain experience, skill and confidence from time with him. . -CLC, CEO of SHREDmill”

“I highly recommend Coach Aj! He has created a program tailored to my individual & fitness goals. He continues to adjust and modify my program as needed to help me progress. I really appreciate the time & effort he puts into making sure my workouts are effective & aligned with what I want to achieve. He pushes me to challenge myself by tracking my progress which helps keep me accountable & motivated to stay on track. What really sets him apart is his motivation, encouragement and dedication.”

“GRGL helped me get faster, stronger, and become a sophomore starting on varsity.”

“GRGL is a great program helped me so much over these 4 years so far made my game better confidence and made me more aware of how stay injury free get better recovery and etc. Coach AJ is the best!”

Tanner Niizawa

Verified GRGL Member

“The work with Coach AJ has been tremendous! I mostly appreciate his precision on proper recovery and injury prevention. His approach to training is not one dimensional and the use of different devices to triangulate data give an undeniable measure of the athletes true outputs. He also brings a wealth of knowledge navigating the recruitment process and finding the right fit if pursuing athletics in college and beyond is a goal. We have been training with Coach AJ for 3 years.”

“Coach AJ is top-of-the-line when it comes to not only training but mentorship!!! The way he approaches his training to meet every athletes needs is very rare nowadays. If you’re looking for somebody to take your kids to the next level, this is your guy.”

“The GRGL program helped build me up to have a strong foundation for speed building, strength, and stamina. The leap in skill progression I felt from my 12u to 14u of pop warner was unbelievable and every movement Coach AJ has had me work has translated over to the field. This is truly an amazing program.”

Nick "Keys" Olivier

Verified GRGL Member

“I connected with Coach AJ nine years ago, during my freshman year at Nassau CC, and has continued to guide and motivate me ever since. He has always challenged me to be intentional, disciplined, and committed to becoming the best version of myself, both on and off the field. We still stay in regular contact, which speaks volumes about the kind of mentor he is. I highly recommend him to any parent looking for someone who will invest in their child’s athletic development, character, & future.”

“Our daughter has trained with GRGL for 8 months now and has seen tremendous growth both physically and mentally. What drew us most to this program is that Coach AJ creates a program with intention to meet each athlete’s goal. We also appreciate the data available to track her development.”

Christian Payne

Verified GRGL Member

“Get Right or Get Left Training has been an outstanding experience, both on and off the football field! What truly sets this program apart is the mentorship, personalized guidance, and genuine commitment to helping young athletes like myself succeed. Through virtual training and mentoring sessions, I continues to gain valuable knowledge about the game, improve football IQ, develop confidence, and better understand what it takes to play on the next level.”

Omar Kevin Ubilla

Verified GRGL Member

“I had the privilege of gaining real world experience at Coach AJ's lab while completing my Master's in Big Data and AI at Real Madrid University. GRGL uses the same tools as the biggest professional sports teams in the world! Way ahead of the game!”