MEASURE WHATMATTERS
Elite testing. Actionable insights. Exceptional performance. Serving athletes, teams, first responders, and other high-performance professionals.
The measurement,
done right.
Hb-mass is one of the strongest predictors of endurance performance we can measure. It's also easy to measure badly. Our protocol is built for research-grade signal on athletes who can't afford noise.
CO-rebreathing
The gold-standard optimized carbon monoxide rebreathing protocol — the same method used in peer-reviewed elite-athlete research.
Precision
Typical error under 2%. Small enough to trust an altitude block, a training phase, or a supplementation trial.
Repeatability
Same technicians, same instruments, standardized prep. Longitudinal data you can actually compare season to season.
Endurance,
measured at altitude.
Athletes and teams using Flagstaff's 7,000 ft training environment to build the aerobic engine — and the coaches who need to know it's working.
Built for
the standard.
A dedicated lab space on the campus of Northern Arizona University in Flagstaff, Arizona — a town that has shaped modern endurance training.
THE EXPERTS IN THE LAB
Scientists and performance staff embedded in Flagstaff's altitude community — with decades of combined work supporting Olympic, World Tour, and collegiate endurance athletes.
Measure the
adaptation.
Schedule an assessment or bring your team to Flagstaff for a full altitude testing block.