> Maybe a 5K or a half ... the article mentions him hitting walls as he hit certain mile markers, Knowing where your walls are ... that's been one of the self-

> Maybe a 5K or a half ... the article mentions him hitting walls as he hit certain mile markers, Knowing where your walls are ... that's been one of the self-reflection exercises for me. Because it is an extremely personal limit & moves about with weight, food intake, sleep debt, hydration and local weather. The physical sensation of hitting the wall is somewhat orthogonal to all the other health benefits - it is an extremely accurate read of your physical condition on that day & tells you how you're doing.