I saw a story on TV once where they did a study on an elite Kenyan runner. They filmed him running then put the images on a computer and found that while he was running both feet were off the ground 75% of the time.
Oddly, I recall a study of Kenya women balancing massive baskets on their heads while walking miles. ...
The study said that the women’s gait, hip swivel and balance allowed this. It’s been forty years ago...the study was done, that is...very interesting how evolution works.
Funny Seinfeld clip about a marathon.
https://youtu.be/Khys7LfwT8c
Race horses too.
I welcome the physics.
Just too interested. ...