About OpFit

A standard of care
earned, not advertised.

OpFit Performance was built at the intersection of clinical insight, special operations discipline, and the highest level of competitive performance — a Performance Health & Human Optimization consultancy for people who refuse to live below their physiological ceiling.

Our Philosophy

Data first. Discipline always.

We do not chase trends. Our approach to biohacking is evidence-informed, personalized, and measurable — one tool within a larger performance-health framework. We build measurable, individualized strategies for clients whose careers, missions, and families depend on them performing at their best.

Every engagement begins with objective data — biomarkers, lifestyle, training history, recovery capacity. From that data we engineer personalized plans that compound into durable change.

"Performance is the byproduct of disciplined precision."

Performance Health, Human Optimization & Biohacking Consultants

Two disciplines. One standard.

OpFit bridges clinical insight with elite human-performance strategy. Together, Guy and Jennifer help clients understand their current physiology, identify meaningful opportunities for improvement, implement personalized strategies, and measure progress over time.

Guy Smith

Founder & Human Performance Strategist · Human Performance & Biohacking Consultant

A career inside Naval Special Warfare preceded a second life on the IFBB Pro stage. Guy has spent over two decades engineering bodies and minds to perform under conditions most people will never face. With more than two decades of performance coaching across tactical, athletic, executive, and high-performance populations, Guy brings deep experience in human performance, nutrition, strength and conditioning, recovery, and real-world implementation.

Jennifer Gestring-Smith, RN, BSN

Director of Performance Health · Performance Health & Biohacking Consultant

Jennifer brings an RN, BSN perspective to the practice — clinical insight, health education, health-history review, biomarker interpretation and education, lifestyle optimization, supplement education, and patient advocacy. She ensures every OpFit performance-health strategy is grounded in physiology, not fashion.

Begin your engagement.

The OpFit Performance Assessment™ is the starting point of every engagement.