Over the past couple of decades coaching endurance athletes, I’ve noticed a consistent relationship between three key performance metrics. Whether this relationship is push-pull or more synergistic is still up for debate—but one thing is clear: when these three improve, so does overall performance. These metrics are: Power or velocity at aerobic threshold (AT) Average power during a 6-minute max effort Peak power during a 10-second sprint When we pair this external data with internal...