Maximize Longevity, Healthspan, and Performance.

With Boston’s Best Personal Training

We’ll train you in your home or office.

Anywhere

in the Boston area.

Or Come See Us in Back Bay

Address: 400 Commonwealth Ave, Boston, MA, 02108

Phone: +1 415-991-7792

Meet The Team

Kyle Mahoney PT, DPT


Doctor of Physical Therapy

Certified Strength and Conditioning Specialist

Brian Clifford DPT, OCS, CSCS


Doctor of Physical Therapy

Physical Therapist II
Primary Spine Practitioner

Get Personal Training For:

  • At ONYX Physical Therapy, we understand that every sport and activity presents unique challenges and demands. Our tailored approach focuses on enhancing your performance while minimizing injury risk specific to your chosen discipline. We work with professional athletes across all sports integrating strength and performance training with injury prevention. Our expert team employs evidence-based techniques to optimize your movement patterns and build resilience against injuries, ensuring you can perform at your best safely over the course of your career. Whether you're a professional athlete or a recreational participant, we are committed to supporting your journey to peak performance over the long haul.

  • At ONYX, we focus on optimizing body composition by addressing both fat percentage and total muscle mass. Our tailored programs combine evidence-based exercise regimens, nutritional guidance, and lifestyle modifications to create a comprehensive approach to wellness and performance. We utilize assessments to establish baseline metrics and monitor progress, ensuring each individual receives personalized strategies that promote fat loss while encouraging muscle growth. Our emphasis on sustainable practices fosters long-term results, contributing to enhanced overall health and longevity. Each step is designed to empower individuals in achieving their specific body composition goals.

  • At ONYX Physical Therapy, we focus on enhancing cardiorespiratory endurance through targeted training that optimizes VO2max, the maximum amount of oxygen your body can utilize during intense exercise. VO2max is a critical indicator of aerobic fitness and plays a significant role in overall health. Higher levels of VO2max are associated with increased longevity and a prolonged healthspan, meaning individuals can maintain their vitality and functional capacity for longer periods.

    Research shows that improved VO2max can lower the risk of chronic diseases, such as heart disease, diabetes, and metabolic syndromes, by promoting better cardiovascular health and efficient metabolic functioning. By incorporating tailored exercise programs that challenge and elevate your cardiorespiratory system, we aim to help you achieve higher VO2max levels, ultimately leading to enhanced well-being and a reduced risk of disease.

  • At ONYX Physical Therapy, we recognize that strength is a vital predictor of longevity and overall health. Our specialized programs are designed to enhance your strength based on your personal goals and areas of focus. Whether you're aiming to develop upper body power, core stability, or lower body endurance, our tailored approach ensures that you receive the targeted training necessary for optimal results. By improving your strength, you not only enhance your physical performance but also work towards reducing the risk of age-related decline and mortality. Invest in your health today and build a foundation for a longer, stronger future.

  • At ONYX Physical Therapy, we understand that flexibility and mobility are essential components of overall health and performance. Our specialized programs focus on tailored assessments and targeted exercises designed to improve range of motion, reduce stiffness, and enhance physical functionality. By incorporating techniques such as dynamic stretching, myofascial release, and controlled movements, we empower individuals to unlock their body's potential. Whether you're an athlete aiming for peak performance or someone seeking to maintain an active lifestyle, our expert guidance and innovative approach ensure that you achieve greater flexibility and mobility safely and effectively. Experience the difference with ONYX and move freely in every aspect of your life.

  • At ONYX, our exercise and personal training services are designed to promote longevity and enhance overall well-being. We understand that maintaining a healthy lifestyle is a lifelong commitment, and we tailor our fitness programs to meet the unique needs of each individual.

    Our approach combines strength training, cardiovascular conditioning, and flexibility exercises, all carefully selected to improve functional movement, bone density, and cardiovascular health. Through our personalized training sessions, clients receive one-on-one attention from experienced trainers who focus on form, technique, and progression, ensuring that every workout is effective and safe.

    We emphasize the importance of consistency and building sustainable habits. Our trainers work closely with clients to establish realistic goals, monitor progress, and make necessary adjustments to keep motivation high and results on track. In addition to physical training, we incorporate lifestyle guidance, nutrition advice, and stress management techniques, understanding that longevity is affected by multiple factors beyond just exercise.

Why choose ONYX for Personal Training?

We Teach At Local Universities and Health Science Schools

Choosing a combined physical therapist and personal trainer who teaches at a Doctor of Physical Therapy (DPT) school ensures you're receiving care from someone at the forefront of the field. We instruct at Massachusetts General Hospital Institute of Health Professions, and Northeastern University Bouvé College of Health Sciences. Our role in educating future clinicians reflects a deep understanding of best practices and a commitment to high standards of care. This expertise can lead to more precise assessments, innovative treatment strategies, and better long-term outcomes for patients.

We Specialize in Orthopedics and Sports

Selecting a physical therapist who has completed a residency ensures specialized expertise in preventing injury and maximizing performance. Our residency-trained therapists underwent advanced training in orthopedics, working with surgeons directly. They have a deep understanding of the human body allowing for more precise and effective treatment, while lowering risk for complications.

We are Strength and Conditioning Coaches

Choosing a physical therapist who is also a Certified Strength and Conditioning Specialist (CSCS) ensures a unique blend of rehabilitation and strength training expertise. This dual qualification allows the therapist to not only address injuries but also design programs that enhance overall physical performance. They understand how to safely progress clients from rehabilitation to peak function, bridging the gap between recovery and higher level activity. This approach is especially valuable for active individuals seeking to return to sport stronger and more resilient.

You won't find a more knowledgeable, dedicated, passionate and trustworthy PT than Kyle. I am a professional triathlete who specializes in long course racing. Kyle is the reason I am now back to racing, pain free, and stronger than ever. He not only saw me for in-person sessions, but also created weekly rehab and strength programs, working closely with my triathlon coach to be sure it was aligned with my swim, bike and run training. I cannot recommend Kyle enough.”

Alice Alberts, Professional Triathelete

  • "Kyle is extremely knowledgeable about the human body, how it performs, and what is needed for YOUR particular injury and/or rehab. He listens to his client and responds to his/her concerns and questions accurately and with empathy. I could go on, but suffice it to say, I highly recommend Kyle as not only an excellent source of recovery, but as a person with honesty and integrity. You can trust his advice and council 100%. "

    - Danny Caverly, PGA Professional

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