Last updated: 3 October 2026
Reviewed by Jordan Morley, FA Level 2 Football Coach
Aerobic capacity is the overall ability of the cardiovascular and muscular systems to take in oxygen (lungs), transport it (heart and blood) and use it to produce energy (muscle mitochondria) during sustained exercise. It is underpinned by VO2 max (the ceiling), lactate threshold (sustainable fraction of that ceiling) and efficiency/economy. Strong aerobic capacity is the foundation of endurance performance and a key marker of cardiovascular health, strongly associated with longevity. It improves with consistent aerobic training, particularly a high volume of Zone 2 work supplemented by higher-intensity intervals.
- Ability to take in, transport and use oxygen
- Underpinned by VO2 max, threshold, economy
- Foundation of endurance and health
- Built by Zone 2 volume + interval work
In practice
Aerobic capacity (often measured as VO2 max) represents the ceiling on how much oxygen your body can deliver to and use in working muscles — raising this ceiling through sustained, progressively harder endurance training is one of the clearest ways to improve performance across virtually every endurance sport, since a higher aerobic capacity gives an athlete a larger overall engine to draw on at any given race pace.
FAQ
How can I improve my aerobic capacity?
Consistent endurance training that progressively increases in volume and intensity over months, including a mix of easy aerobic volume and periodic harder efforts near or above VO2 max intensity, is the standard approach.
Is aerobic capacity the same as endurance?
They're related but distinct — aerobic capacity is the physiological ceiling of oxygen delivery and use, while endurance also depends on factors like running/cycling economy, fuel use and mental pacing that determine how well that capacity translates into sustained real-world performance.