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Your metabolism is more than just calories in versus calories out. It is a complex system of fuel utilization and efficiency. We break down the key physiological markers—from FatMax to VO2 Max—to show you exactly how to interpret the data that powers human performance.
Breath Don't Lie
RESPIRATORY FOUNDATIONS
The raw biological data captured breath-by-breath. These are the building blocks of your metabolic profile.
VO2 (Oxygen Uptake)
The fundamental measure of aerobic work. It tracks the precise volume of oxygen your body extracts from the air and uses for energy at any given second.
VCO2 (Carbon Dioxide Output)
The amount of carbon dioxide produced as a byproduct of metabolism. Rising VCO2 levels indicate shifting fuel sources and increasing intensity.
RER (Respiratory Exchange Ratio)
he calculated ratio between CO2 produced and O2 consumed. This critical number reveals "metabolic flexibility"—whether your body is burning fat or carbohydrates at that exact moment.
Tidal Volume
The amount of air inhaled in a single breath, representing breathing depth. Useful for distinguishing shallow versus deep breathing patterns.
Minute Ventilation (Ve)
The total volume of air cycled through your lungs in one minute. It measures the overall workload of your respiratory system.
Tidal Volume (Vt)
The amount of air inhaled in a single breath, representing breathing depth. Useful for distinguishing shallow versus deep breathing patterns.
Respiratory Frequency
The number of breaths per minute. Like heart rate, it responds quickly to intensity changes and helps detect over-breathing or ventilation inefficiencies.
METABOLIC INTELLIGENCE
Advanced metrics derived from your respiratory data. These define your performance potential and training prescriptions.
VO2Max
The gold standard of cardiovascular fitness. It represents the maximum amount of oxygen your engine can utilize during all-out effort—your aerobic ceiling.
FatMax
The specific intensity "sweet spot" where your body burns the highest amount of fat per hour. Training here maximizes metabolic efficiency and endurance base.
LT1 & LT2 (Lactate Thresholds)
The two critical turning points in your physiology. LT1 marks the limit of easy, sustainable effort; LT2 marks the "red line" where fatigue accumulates rapidly.
True Zones
We go beyond generic age-based math with biology. These are your custom heart rate and pace zones, scientifically anchored to your unique LT1, LT2, and VO2 Max.
Fuel Utilization (Carbs vs. Fat)
A granular breakdown of energy cost. We quantify exactly how many grams of fat versus carbohydrates you burn at every level of intensity.
Running Economy
"Fuel efficiency." It measures how much oxygen you require to maintain a specific speed. A better economy means you can run faster while using less energy.
RUNNING MECHANICS
Non-respiratory metrics that analyze your movement efficiency and injury risk.
Cadence
The number of steps taken per minute. Optimizing cadence reduces joint impact and improves forward momentum.
Vertical Oscillation
The amount of vertical "bounce" in your stride. Minimizing excess bounce saves energy for forward motion.
Ground Contact Time
The milliseconds your foot spends on the ground. Shorter contact times indicate better explosive power and efficiency.
Left-Right Balance
A symmetry check that compares the ground contact time of each foot to identify imbalances that could lead to injury.
Stiffness
A measure of your legs' ability to act like springs, storing and releasing energy efficiently with each step.
Flight Time
The duration your body is airborne between steps. Higher flight time typically correlates with a longer, more powerful stride.
