Maximize Longevity, Healthspan and Performance.

With Boston’s Best Personal Training

Come Visit Us

Back Bay

400 Commonwealth Ave, Boston, MA, 02108

West End

1 Hawthorne Place, Suite 101, Boston MA 02114

Or Let Us Travel to You

Anywhere in the greater Boston area

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


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Why choose ONYX?

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. I can’t recommend Kyle highly enough.”

Alice Alberts, Professional Triathelete

What clients say about ONYX