Welcome to the age of the impossible pace. From Kelvin Kiptum’s sub-2:01 marathon to Ruth Chepng’etich’s near-record splits, we’re living through a golden era of distance running—and it’s no accident. Behind these stunning performances lies a revolution in physiology, biomechanics, footwear, pacing strategy, and data-led training. This article unpacks how sport science, psychology, and precision planning are redefining the outer limits of human endurance. It’s not just about