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You just ran a 5K in 26:45. Your training partner, who is 58 years old, ran the same race in 28:10. You finished faster — but who had the better performance? That question has no good answer without age-grading. With it, the answer is immediate, mathematically precise, and often surprising. The Problem Age-Grading Solves Comparing […]

VO2 Max is the single most important number in distance running. It is your body’s maximum rate of oxygen consumption — the ceiling on how fast your aerobic engine can run. Every training pace, every race prediction, every honest comparison between runners traces back to it. The good news is you do not need a