At Redefine Fitness, we are dedicated to helping Setauket and East Setauket residents achieve their health goals through premium personal training at our Stony Brook and Mount Sinai locations. We deliver individualized, results-driven coaching through private sessions, small-group training, and fully tailored programs suitable for every age and fitness level.
As the premier choice for Setauket and East Setauket residents, Redefine Fitness provides certified personal trainers with extensive experience working with unique client needs. We ensure every individual from the Setauket area receives safe, inclusive, and highly effective support designed specifically around their goals and lifestyle.
Experience private, fully personalized training designed exclusively around your goals, lifestyle, and schedule. Whether you are beginning your fitness journey, recovering from an injury, or pushing past a long-standing plateau, our coaches reject cookie-cutter templates in favor of a training system built uniquely for you. Our team is not only certified but highly educated and experienced, providing the expert guidance and accountability needed to achieve real, measurable results.
A personalized weekly training plan that’s continually updated
Training sessions designed 100% around your goals
Every coach trains hard, leads by example, and lives the lifestyle they teach
A private setting designed for focus and confidence
Semi-Private Training
Experience the perfect balance of individualized coaching and community motivation with our semi-private training. You’ll train alongside no more than three other participants, allowing you to benefit from the camaraderie of a group while receiving the premium, expert instruction typically reserved for one-on-one sessions—all at a more cost-effective rate. Every workout is meticulously tailored to your unique goals, ensuring you get the personalized attention you need to drive real progress in a supportive, high-energy environment.
Ideal for those who enjoy training alongside others yet need individualized plans
Ideal for those looking for premium Redefine coaching at a more affordable price
Clients who appreciate motivation, community energy, and consistent training habits
You’ll receive the same high-level coaching and accountability as one-on-one training—at a more affordable rate, along with the added motivation and support of a small-group environment.
Core plus membership
Clients who enjoy a shared space but still want individualized programming
Detox, recover faster, and enhance circulation with unlimited access to our private infrared sauna.
Grab any drink from our wide selection of beverages to help fuel your workout.
Get a great workout punching and kicking some bags. These 45 minute classes are small and catered to all ages & abilities.
Work directly with a dedicated coach who provides personalized meal planning, macro guidance, ongoing accountability, and regular progress check-ins. Our flagship program offers a high level of customization and expert support—without requiring you to give up your favorite foods or follow restrictive, complicated diet rules.
60-minute comprehensive nutrition analysis to start
Bi-weekly check-ins with your personal nutrition coach
24/7 access to your coach via text, email, or in-person
No food restrictions—just smarter strategies using macro tracking
Elite Membership
For clients looking for the most comprehensive Redefine Fitness experience, our Elite Membership provides exclusive benefits, enhanced accountability, and a fully integrated approach to both training and recovery. It’s the premier option for those committed to long-term health, consistency, and peak performance.
Unlimited 1:1 Personal Training
Monthly massage therapy
Ongoing nutrition coaching
Access to infrared sauna sessions
Exclusive Redefine apparel
Guest privileges to bring a friend
Ongoing nutrition coaching
Access to infrared sauna sessions
Personal training is a strategic investment for anyone looking to maximize their physical potential. It is particularly effective for:
Fitness Beginners: Establishing a foundation of proper biomechanics and structural discipline.
Body Composition Goals: Individuals targeting sustainable fat loss or hypertrophy (muscle growth).
Athletic Performance: Anyone seeking expert feedback to overcome plateaus and optimize output.
Injury Rehabilitation: Safe, corrective exercise and movement modifications for post-rehab strength.
High-Performance Lifestyles: Busy professionals requiring efficient, high-impact routines tailored to a tight schedule.
A professional personal fitness coach serves as your architect for physical health. Beyond simple exercise instruction, a top-tier trainer provides a comprehensive ecosystem of support, including:
Customized Macro-Programming: Science-based workout cycles (periodization) designed for your specific fitness level.
Kinesthetic Coaching: Real-time form correction to ensure safety and joint longevity.
Behavioral Accountability: Data-backed motivation to ensure consistency even when willpower fades.
Physiological Monitoring: Tracking metrics like strength gains, mobility improvements, and body composition changes.
| Feature | Technical Description | Client Benefit |
| Precision Programming | Data-driven cycles tailored to physiological baselines. | Faster results with zero guesswork. |
| Biomechanical Coaching | Expert form optimization and movement screening. | Maximum efficiency with reduced injury risk. |
| Strategic Accountability | Psychological support and habit-tracking systems. | Long-term consistency and lifestyle integration. |
An elite personal training program is a dynamic process that evolves as you do. Our system includes:
Comprehensive Fitness Assessment: Evaluating baseline mobility, strength imbalances, and metabolic goals.
Integrated Strength & Conditioning: Combining resistance training with cardiovascular health for total wellness.
Corrective Exercise & Mobility: Addressing tight tissues and weak links to improve functional movement.
Iterative Progress Evaluations: Bi-weekly or monthly adjustments based on performance data.
Holistic Wellness Support: Guidance on sleep hygiene, nutrition, and stress management.
Hiring an expert trainer—specifically a highly-educated professional—is the fastest way to bridge the gap between where you are and where you want to be:
Efficiency: Stop wasting hours on ineffective exercises; move with purpose.
Safety: Protect your joints and spine through expert-monitored technique.
Longevity: Build a body that moves well for decades, not just weeks.
Clarity: Remove the mental fatigue of deciding “what to do” at the gym.
Generic “box gym” templates fail because they ignore bio-individuality. Personalized coaching works because it:
Respects Your Anatomy: Adjusts movements based on your limb length and injury history.
Scales with Your Success: Progressively increases intensity (Progressive Overload) to prevent stagnation.
Integrates with Your Life: Adapts to your energy levels, travel schedule, and stress.
At Redefine Fitness, our certified specialists combine academic knowledge with practical experience to deliver an unmatched training environment. Whether you are at our Mount Sinai or Stony Brook facility, we focus on the five pillars of human performance:
Functional Strength
Active Mobility
Cardiovascular Capacity
Mental Confidence
Total Body Health
Book Your Assessment at Redefine Fitness Today
Redefine Fitness serves the Saint James, Setauket, and Old Field communities from two convenient locations in Stony Brook and Mount Sinai. Our Stony Brook facility is a short drive via Route 25A, offering residents easy access to elite, private coaching and semi-private training sessions.
Unlike “cookie-cutter” templates, personalized coaching at Redefine Fitness utilizes progressive overload and biomechanical assessments to create a plan unique to your anatomy. This ensures you reach your goals—whether it’s weight loss, muscle hypertrophy, or injury recovery—faster and more safely than following a generic routine.
Absolutely. We specialize in helping beginners in the Old Field and Setauket areas build a foundation of confidence and proper technique. Our certified coaches provide real-time form correction and structured accountability to ensure you stay consistent and injury-free from day one.
Semi-private training involves working with one expert coach in a small group of up to four clients. It is ideal for residents looking for a cost-effective way to receive premium instruction while benefiting from the motivation and camaraderie of a small-group environment.
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