The Team


Zack earned a Bachelor of Arts degree from Syracuse University in Industrial Design and studied Exercise Physiology. Zack’s senior Industrial Design thesis used both academic disciplines to develop a sports-specific exercise machine. After college, he started CoreXcell in 2006 with the goal to develop an organized training system to be implemented into other training facilities around the country and to give athletes the advantage they need to improve speed, athleticism, and strength year after year. The CoreXcell system is becoming nationally recognized and has been licensed to a number of different sports facilities including Hawk Sports and Simoneau Sports Zack, with the help of Brandon Byrd, has helped hundreds of athletes in the Lehigh valley reach their full physical potential from all levels and sports. As an athlete, Zack was ranked 78th in the nation in juniors’ tennis and was a PIAA District 11 tennis champion as sophomore in 1993 for Emmaus High School.


Tyler Marx was a two sport athlete, Wrestling and playing Football at the College level. He studied Athletic Training at King’s College and continues to educate himself on the latest practices of injury rehabilitation and  prevention. Having injured himself multiple times throughout his career, he enforces the importance of taking care of your body on and off the field to athletes and adults of all ages. He is also a Certified Personal Trainer and runs the Adult Fitness Training Program within the CoreXcell facility. He is an ambassador for Lululemon Athletica and runs fitness classes for their events. Tyler has developed a Fitness Program for the U.S Air Marshalls. He has also developed a Wrestling specific workout program with Former Lehigh University NCAA Wrestling National Champion, Zachery Rey and University of Maryland Runner-up, Jimmy Sheptock. Tyler continues to make connections with coaches using CoreXcell Mobile, which allows him to bring workouts to their practice facilities.


Ryan attended Temple University earning his B.S. in
the Pre-Health Profession and is working on earning his Doctorate in Physical Therapy and Masters in Nutrition.
He played varsity baseball for Emmaus High School and played Rugby and Baseball for all 4 years at Temple.
He has been working at the CoreXcell Philly location for 3 years while earning his degree.  He has worked with Temple Football players designing and creating workout programs and meal plans to maximize results at the Division 1 level. Ryan is also an adult fitness trainer for CoreXcell. He continues to educate and apply himself to maintain training safety and preventing injuries on and off the field.


Mario Barrantes attended Pennsylvania State University, earning his B.S. in Kinesiology, in 2004. He is a former professional soccer player in the Costa Rican Premier League. He is Co-Developer of Dynamic Rehab Resolutions, a Rehabilitation software business. It would allow doctors and therapists to customize and select certain exercise treatment plans to use on patients.

He is a certified massage therapist with his own practice and he has rehabilitated hundreds of athletes over the last 15 years. He worked as a Orthopedic Representative with Depuy Orthopedics from 2007-2011. He has worked for Dr D’Arco’s practice, PA Muscle Bone Joint Clinic from 2013-2016, as a Physical Rehabilitation Manager. Developing specific treatment plans for patients.