Below are slow motion videos of Kenyan runners shot by Dr. Daniel Lieberman of Harvard University demonstrating some of the patterns discussed in Chapters 3, 7 and 8 of Tread Lightly.
First is a barefoot adolescent Kenyan who has never worn shoes. This is the video described at the opening of Chapter 8. Note the forefoot contact and the lack of excessive forward extension of the leg upon landing (i.e., not overstriding).
Next is an elite Kenyan running barefoot. This individual grew up barefoot, but started wearing shoes later in life.
Finally, here is an elite Kenyan running in shoes. This individual grew up barefoot, but started wearing shoes later in life.