Quote by Kenneth H. Cooper
Now I say that if you run more than 15 miles a week, it's for something other than aerobic fitness. Once you pass 15 miles, you do not see much further improvement.
Summary
This quote suggests that running more than 15 miles a week does not significantly contribute to improving one's aerobic fitness. It implies that there is a point of diminishing returns for running when it comes to cardiovascular benefits. While running can still offer other benefits beyond this threshold, such as mental well-being or maintaining a certain level of endurance, the quote implies that additional miles might not bring about substantial aerobic gains.