We were fortunate tohave a nice soft track for our track and field in high school. In middle school, on an asphalt track with painted lines, I took out a hurdl

We were fortunate tohave a nice soft track for our track and field in high school. In middle school, on an asphalt track with painted lines, I took out a hurdle and a chunk of my hip learning to run hurdles. Sometimes people fall where they're running. The roughness of a soft track also scrapes but it's definitely nicer than road runs IMHO. I really doubt that we're evolutionarily tuned for running on hard surfaces. So, the control model for this study For how many generations have humans had what kinds of shoes