Over 20 Years of Experience

At OPEX, the people we serve and the experience we provide are the most important part of what we do. Our culture is at the centre of everything. We believe that through the experience of fitness, we help people live a greater life, and our systems and processes are set up to support this.

We coach individuals at any fitness level, for nearly any endeavor. We help people move better, move more, and perform to their highest potential. We are a staple in the community for honest, results driven fitness and health. We view fitness as an evolving journey and exploration of the connection between spirit, mind and body while attempting to discover physical potential – leading to the discovery of purpose and longevity of oneself. At OPEX, our commitment to continual learning and passion for sharing that knowledge ensures that our clients have the best experience possible of fitess: the OPEX Experience.


Our goal is to build a brand that is built on one main purpose – “To inspire people to live larger lives.” When you are in our facility you will immediately understand that your best interests are aligned with your coach’s as well as the gym’s owners.


Every workout is specifically designed to optimize your long-term results. With monthly consultations to maintain focus on “big picture” success, along with assessments and nutritional guidance to ensure you are progressing physically, OPEX delivers ongoing support toward your goals in and out of the gym.

Best Parts of Training Under One Roof

When you start training at an OPEX Mount Sinai, you’ll have your own personal coach who designs all of your workouts and your nutrition planning. Every day you’ll have the opportunity to work out with a great group of like-minded clients and you will have a coach on the gym floor who will make sure that you are moving safely and effectively.

The Process:

Meet the team that makes it all possible.

Zahraa Stuart
Born and raised in Beirut, Zahraa moved to New York in 2014 to pursue her Engineering Degree – now pursuing her Ph.D. at Stony Brook University. Zahraa has had made an enormous amount of progress in both her health, strength, mindset etc from engaging in a physical practice under Coach Jonathan and thus believes and maintains that all people deserve the right to live a healthy, pain free, invigorating life where they can DO WHAT THEY WANT. As a result of this she decided to join forces with OPEX Mount Sinai. She manages the day to day operations and is in charge of client support. If you have any inquiries personal/business contact her through the email provided below.
Andrew Vanbourgondien
Drew has been training for 15 years and became
fascinated with human movement and started his
training career back in 2014. He loves helping
others achieve their fitness goals and building
new relationships. Drew truly believes that
fitness programs must be designed for the
individual rather than the group: “People
should be approached with an integrative
perspective in terms of lifestyle,
nutrition, and movement.” His goal in life
is to help many people reach their goals & to
create and nourish those relationships so that
they can last a lifetime. His ideal client is
someone willing to learn and humble enough to
attack their weaknesses and to be held
accountable.He was admitted to SCCC’s physical
therapy assistant program & worked as an aide
in a physical therapy clinic.He decided to opt
out of that program because He believes
he can make a larger Impact in the gym
so that people do not end in need of physical
therapy in the first place.
Jonathan Stuart
Head Coach
Jonathan has been in the strength and conditioning field for close to 12 years. He is OPEX CCP Certified, CrossFit Certified, Training Think Tank Athlete & Movement Certified, and First Aid/CPR/AED Certified. He opened a CrossFit gym in 2014 and has since established OPEX Mount Sinai as the first and only Personalized Fitness training method gym on Long Island. He has worked with professional athletes, Division I athletes, CrossFit Competitors, Weightlifters, Powerlifters, Bodybuilders. His specialty is injury prevention, return to performance rehabilitation, and getting people to live functional pain-free lives. For the past 10 years he has been actively working to improve the lives of those who are mid-age, senior and retiree’s.

free consultation! 
We are so confident, your initial consultation is completely free.