Fast, slow, or zombie-like — just run

Running brings out divide between fit and fat Americas – Opinion – The Boston Globe

Here’s the truth: The reason American kids run a mile slowly is because so many adults can’t run one at all. The 15.5 million runners who competed in road races last year cast an oversized shadow that hides the 300 million who didn’t. Proportionally, few adults run; by comparison, our sluggish kids are speed demons.