I'm sure it's been posted here many times, but I enjoyed this article when I first read it a year ago or so.
It is about Erwan Le Corre, the owner of MovNat. He has the right idea about how humans should be exercising.
Heres the link to the article:
And the some videos Erwan has on Youtube.
One thing I want to point out about his videos is his sprinting technique.
Even though he is running very fast, he is very very relaxed. His arms are relatively low to his side, and he looks very comfortable.