Daniel Belli | Owner

Strength and Conditioning Coach

Daniel Belli has owned and operated Mason Street Strength and Fitness since January 2016. He earned a Bachelor of Science in Exercise Science/Physical Education at Southern Connecticut State University, he is certified in Physical Education K-12 by the State of Connecticut. Daniel has taken his experience as a collegiate football player as well as a decade in the industry to help develop and implement programs for adults and youth athletes alike. His training approach encompasses the mind and the body to provide clients with a positive experience for achieving their fitness and lifestyle goals. Daniel has helped many high school student athletes elevate their performance to allow them the opportunity to be recruited for college sports.

In addition to working with clients directly, Daniel has also held management positions, both as a Fitness Training Manager and Personal Training Director, in fitness clubs throughout Connecticut and New York. He has also coached high school football as well as directed and implemented their strength and conditioning programs.

Additional Certifications: Certified Physical Preparation Specialist (CPPS), FMS Level 1 & 2, CPR, First Aid & AED.

Kyle Marandino | Coach

Strength and Conditioning

Kyle is a Certified Strength and Conditioning Specialist (CSCS) through the NSCA. In addition, he is a Registered Strength and Conditioning Coach (RSCC), an elite certification that distinguishes individuals who have substantial experience as a strength and conditioning coach in the professional or collegiate setting.

Prior to joining Mason Street Strength, Kyle was a Strength and Conditioning Coach within the Boston Red Sox organization where he assisted in the design and implementation of the strength and conditioning program for both major league and minor league players. Earlier Kyle worked as a Football Strength and Conditioning Intern at the University of South Carolina where he assisted in all aspects of the Gamecock football strength and conditioning program as well as with track and field.Kyle has also worked with male and female athletes from a wide variety of Division 1 sports at the University of Connecticut, Quinnipiac University, and in the high school setting.

Kyle graduated from Springfield College with a BS in Applied Exercise Science.

Keith Kirwan | Coach

Strength and Conditioning

Keith Kirwan’s training begins with a plan tailored for each client. Keith brings together movement, posture, proper mechanics, injury prevention, and strength for a comprehensive, total body approach. There is no one way to be strong, so whether your goal is ligament/tendon strength, cardiovascular strength, muscular strength, postural strength, or explosive speed, Keith has a plan. It’s all about training harder and smarter to achieve success.Keith’s journey into the field of physical preparation began early. He discovered that natural athleticism wasn’t enough to stand out; to shine requires physical preparation and training. And the results quickly showed: he made tremendous improvements on the football field and in track and field. Today, Keith uses his trainer education and first-hand experience to excel as a coach, to inspire and guide others.Keith is a certified NASM Certified Personal Trainer and a CPPS Certified Physical Preparation Specialist.

Brett Parsell | Coach

Strength and Conditioning

Brett received his BS in Exercise Science from Central Connecticut State University. Prior to that he was a two sport athlete at Becker college, where he played football and lacrosse. Brett's most recent experience was that of a sports performance coach at Velocity Sports and Parisi Speed school in Westchester, NY. With over 5 years of experience in the field Brett has worked with countless athletes and many high schools and AAU programs in Fairfield and Westchester Counties. Brett is a Certified Exercise Physiologist through the American College of Sports Medicine and is CPR/ AED certified through the American Red Cross.

"After receiving several offers from facilities in Greenwich and Rye, I ultimately chose Mason Street Strength & Fitness because of the atmosphere and the coaches," Brett explains. "As soon as you walk down the stairs you know it’s time for business! As their coach, clients can expect a FUN but tough workout. I’m most looking forward to adding even more value to a facility that has helped so many reach their maximum potential, adults and young athletes alike."

Jaymes Groat | Coach

Strength and Conditioning

Jaymes Groat brings almost a decade of experience as a Certified Strength & Conditioning Specialist through the National Strength and Conditioning Association (NSCA). As a professional trainer, Jaymes guides clients across all ages and abilities. He has worked throughout the Finger Lakes region and lower Fairfield County, including many years at Equinox’s Greenwich location.

Before pursuing a career in fitness, Jaymes was a competitive tri-sport athlete. He used his passion for strength and conditioning throughout his college years and after. His time in the gym provided critical hands-on knowledge for how to better prepare the body for sports. Today, Jaymes uses sport performance as the backbone for his training programs—helping clients increase muscle mass, speed and power and avoid injury.

“Mason Street Strength & Fitness is by far the best facility I have come across for the development of youth athletes in this area,” says Jaymes. “Everybody comes in ready to work. Athletes are having fun reaching their goals and getting some of the best coaching in Connecticut.”

In addition to his NSCA certification, Jaymes holds a BS in Kinesiology from SUNY Cortland.