Business Details
10 Years
experience
Your Premier Fitness Destination in Greenwich, CT
Mason Street Strength & Fitness is a premier fitness facility dedicated to helping individuals of all ages achieve their personal and athletic goals through science-backed training methods. Founded in 2016 by Daniel Belli, a certified strength and conditioning specialist with over a decade of industry experience, the company combines expertise in physical preparation, sports performance, and holistic wellness. Our team of nationally certified coaches brings decades of combined experience working with athletes from youth to professional levels, as well as adults seeking improved fitness and health. We specialize in customized programming that addresses individual needs while emphasizing proper mechanics, injury prevention, and long-term development.Our facility in Greenwich, Connecticut, offers a comprehensive approach to fitness that integrates strength training, speed and agility work, prenatal/postnatal care, and personalized coaching in a supportive, results-driven environment. With multiple coaches holding advanced certifications from organizations like NSCA and NASM, we maintain rigorous professional standards while fostering a community-focused atmosphere that prioritizes client success and well-being.
Services
Strength Training
Personal Training
Youth Training
Prenatal Fitness
Postnatal Recovery
Tandem Training
Stretch Therapy
Athletic Performance
Speed Development
Mobility Workshops
Details
- Year established: 2016
Highlights and features
- We offer personalized training programs developed by nationally certified strength coaches.
- Our team includes former collegiate athletes with decades of sports performance experience.
- We specialize in youth athlete development with injury prevention-focused programming.
- Our prenatal/postnatal specialists provide tailored fitness solutions for all stages.
- We maintain a supportive community environment that prioritizes long-term client success.
Associations and certifications
- NSCA
- NASM
- CSCS
- ACSM
- FMS
What people say
Great equipment and trainers
Highly recommend
Best training environment
Real results
Family-like atmosphere
Services
Strength Training
Our strength training programs develop muscular power and endurance through scientifically validated methods. Using multi-joint movements and posterior chain development, we create individualized regimens that improve athletic performance and functional fitness. Clients benefit from periodized programming that systematically increases intensity while maintaining proper form and technique.
Youth Training
Specialized youth programs focus on long-term athletic development with injury prevention as a priority. We teach proper movement patterns, deceleration mechanics, and relative strength training for young athletes. Our age-appropriate programming builds foundational skills while preparing participants for competitive sports at higher levels through safe, progressive overload techniques.
Prenatal Fitness
Tailored exercise programs maintain fitness during pregnancy while addressing specific physiological changes. Sessions focus on controlled heart rate elevation, joint mobility, and core stability to support healthy weight gain and prepare for labor. Our certified specialists modify exercises to accommodate each trimester's unique requirements and individual needs.
Personal Training
Customized fitness solutions address individual goals through dedicated coach-client partnerships. Programs integrate strength, mobility, and conditioning components while adapting to personal limitations and progress. Our certified trainers provide continuous form correction, motivation, and program adjustments to ensure consistent progress toward specific objectives.
Postnatal Recovery
Structured rehabilitation programs restore core strength and pelvic floor function after childbirth. We address diastasis recti and postural imbalances through progressive exercises that rebuild foundational stability. Our approach combines mobility work, strength training, and functional movement patterns to safely return clients to pre-pregnancy fitness levels over 6-12 months.
People
Daniel Belli
Owner
Daniel Belli founded Mason Street Strength in 2016 after earning his Exercise Science degree and teaching certification. A former collegiate football player, he combines 15+ years of industry experience with coaching expertise from managing fitness operations across Connecticut and New York.
Kyle Marandino
Coach
NSCA-certified strength coach with experience in Major League Baseball and NCAA Division I programs. Kyle specializes in designing performance programs for professional athletes while applying elite training principles to general fitness clients.
Keith Kirwan
Coach
Specialist in comprehensive physical preparation with NASM and CPPS certifications. Keith develops individualized programs focusing on movement quality, injury prevention, and balanced strength development across multiple fitness domains.
Kate Stahl
Coach
Certified pre- and postnatal specialist with marathon running background. Kate provides personalized training for women through all stages of pregnancy and postpartum recovery, addressing diastasis recti and functional strength restoration.
Julianna Fauci
Coach
Kinesiology graduate with two years of high-level athlete training experience. Combines performance training with rehabilitation principles, focusing on integrated movement patterns and long-term physical resilience for diverse client populations.
Questions
What types of training programs do you offer?
We provide strength training, youth athlete development, prenatal/postnatal fitness, personal training, and post-injury rehabilitation programs tailored to individual needs and goals.
Do you specialize in working with athletes?
Yes, our coaches have extensive experience training athletes from youth to professional levels, focusing on performance enhancement, injury prevention, and sport-specific development.
Are your trainers certified professionals?
All coaches hold nationally recognized certifications from organizations like NSCA, NASM, and ACSM, with many possessing advanced degrees in exercise science and related fields.
Can I get training during early morning hours?
Our facility is open from 5:00 AM to 8:00 PM Monday-Friday, and 5:00 AM to 5:00 PM on Saturdays to accommodate early training schedules.
Do you offer family or group training options?
Yes, we provide tandem training programs for partners and family members, combining personalized attention with shared motivation benefits in our group training sessions.
What makes your prenatal training unique?
Our prenatal programs combine medically informed exercise guidelines with performance training principles, focusing on preparing the body for labor while maintaining fitness throughout pregnancy.
