About Valence
Your health, fully integrated — and personally guided.
Valence began with a simple observation: the people most disciplined about their work, training, and time often have the least clarity about their own physiology. We built a calm, precise way to change that.
The philosophy
Clarity is the luxury.
The promise of Valence isn’t a miracle or a shortcut — it’s a clear, honest read of where you actually stand, and a team to help you act on it. We sell measurement and clarity, not fear and not guarantees.
The work happens in Boston, operated by Back Bay Fit at 400 Commonwealth Ave, as a joint venture between two practitioners who care about doing this precisely.
Measured, not guessed
We start from data — real measurements of your body, your engine, and your blood — not assumptions.
Calm and unhurried
Premium doesn’t mean rushed. Your visit and your readout are given the time they deserve.
Complementary care
We work alongside your healthcare, never in place of it, and we’re clear about that line.
The team
A joint venture, by design.
Valence is a partnership between Back Bay Fit and MoveWithONYX — performance and rehabilitation, under one roof.
Johnny Loreti, MS, CSCS, CPT
Co-founder
Johnny is the founder of Back Bay Fit, a Boston performance and training practice built around measurement — VO2 max, body-composition, and metabolic testing paired with personalized coaching. A strength and conditioning coach and lifelong competitor, he brings a performance-first, data-driven philosophy to precision health.
Dr. Kyle Mahoney, DPT
Co-founder · Physical therapy (MoveWithONYX)
Kyle is a sports-residency-trained Doctor of Physical Therapy and Certified Strength and Conditioning Specialist who owns MoveWithONYX, a Boston-based sports and orthopedic physical therapy practice. He completed his sports physical therapy residency at the University of Southern California and teaches as adjunct faculty at Northeastern University and the MGH Institute of Health Professions.
Dr. Steven Zivich
Physician Partner — Concierge Medicine
Dr. Zivich is a Boston-based, board-certified family medicine physician whose work emphasizes preventive, lifestyle-focused care delivered directly to patients, outside the constraints of the traditional insurance model.
Dr. Paul Heinzelmann
Physician Partner — Concierge Medicine
Dr. Heinzelmann is a Boston-based primary care physician affiliated with Massachusetts General Hospital. With more than two decades in primary and urgent care, his practice centers on small panels, unhurried visits, and evidence-based, lifestyle-focused medicine.
Physician partners: Dr. Steven Zivich and Dr. Paul Heinzelmann (independent, licensed — concierge medicine). Valence itself is not the licensed medical provider. [confirm scope/claims with clinician + attorney] Bios summarize publicly available information and are pending the team’s confirmation.
Meet us
Come establish your baseline.
Book your physical, or start with a free discovery call to see if Valence is right for you.
Not sure where to start? Book a free discovery call →