Training for a marathon seems to demand relentless effort—but the science suggests the opposite. Research shows that high-volume, low-intensity running does more to improve lactate threshold, oxygen uptake, and overall efficiency than constant high-effort workouts. Data from thousands of runners reveal that logging steady, comfortable miles correlates more strongly with faster race times, while smart tapering and aggressive carbohydrate loading can further enhance performance. In this episode, we unpack why most amateur runners train too hard, and how slowing down might actually be the fastest path to the finish line.

https://www.economist.com/science-and-technology/2025/12/26/what-is-the-best-way-to-train-for-a-marathon