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Metrics that Matter Most.
Your physiology is more than a single number. Metabolix measures how your body uses energy at rest, produces it during exercise, transports and uses oxygen, responds as intensity rises, and recovers when the work stops.
Resting Metabolic Rate
Resting Metabolic Rate (RMR) is the amount of energy your body requires each day simply to sustain essential functions such as breathing, circulation, organ function, body temperature regulation and tissue repair. It establishes your metabolic baseline, making it possible to set calorie and fueling targets around what your body actually needs rather than relying on population estimates that can leave you underfed, overfed or working against your goal.
Metabolic Flexibility
Metabolic Flexibility describes your body’s ability to use fat and carbohydrate appropriately as energy demand changes. Greater reliance on fat during low-demand conditions helps preserve limited carbohydrate stores for when intensity rises, supporting more efficient energy use, greater endurance and better control over how much carbohydrate you need to fuel training and recovery.
Metabolic Efficiency
Maximum Fat Oxidation (MFO) represents the highest rate at which your body can use fat to produce energy during exercise. A greater fat oxidation capacity allows more of your energy demand to be met from an abundant fuel source before carbohydrate use becomes dominant, helping preserve limited glycogen stores, sustain longer efforts and make fueling requirements more predictable.
Aerobic Endurance
Ventilatory Threshold 1 (VT1) is the first major transition in your response to increasing exercise intensity, marking the point where comfortable aerobic work begins to become progressively more demanding. A higher VT1 means you can move faster, produce more power or sustain a greater workload before breathing, carbohydrate demand and fatigue begin to rise significantly, making everything below that point feel easier and improving your ability to perform for longer.
Aerobic Power
Ventilatory Threshold 2 (VT2) is the second major transition in your response to increasing intensity, where breathing rises rapidly and the effort becomes increasingly difficult to sustain. A higher VT2 means you can maintain a faster pace, greater power or harder effort for longer before rapidly accumulating fatigue, directly improving your ability to sustain demanding efforts in training and competition.
Aerobic Performance
VO₂ Max is the maximum rate at which your body can take in, transport and use oxygen during intense exercise, representing the upper limit of your aerobic system. A higher VO₂ Max gives you a larger aerobic engine and greater potential for endurance and high-intensity performance, while also being one of the strongest established indicators of overall cardiorespiratory fitness and longevity.
Cardiovascular Efficiency
VO₂ Pulse represents the amount of oxygen your body uses with each heartbeat during exercise, reflecting the combined influence of cardiac delivery and oxygen extraction by the working muscles. A greater VO₂ Pulse means more oxygen is being utilized with every beat, allowing the cardiovascular system to support higher exercise demands more economically and providing a valuable marker of adaptation to aerobic training.
Cardiovascular Recovery
Heart Rate Recovery (HRR2) is the reduction in heart rate during the two minutes immediately following maximal exercise, reflecting how efficiently your cardiovascular and nervous systems transition away from maximum effort toward recovery. Faster recovery is associated with stronger aerobic fitness and allows the body to reset more effectively after hard efforts, supporting repeated high-intensity work, recovery between sessions and overall cardiovascular health.
Ventilatory Efficiency
VE/VCO₂ Nadir represents how much air you need to breathe to clear a given amount of carbon dioxide during exercise. Greater ventilatory efficiency means your respiratory system can manage increasing metabolic demand with less unnecessary breathing, reducing the work of breathing and helping exercise feel more controlled as intensity rises.
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