Jogging Tips and Guidelines
The Seven Year Rule
Runners improve for about seven years.
Mike Tymn noticed this in the early 1980s and wrote about it in his National Masters News column. My seven year adaptation theory was based on the fact that so many runners I talked to ran their best times an average of seven years after they started, he recalls.
The Exception Low mileage runners can stretch the seven years to well over a decade before plateauing.