This video is not about running (well, actually it is, but that is not my point). This is a great video about setting high standards for yourself. It is about knowing what you are really made of. It is about stepping out of your comfort zone and pushing your limits.
By the way, if you want to know more about this remarkable person, I highly recommend you to read the following article: David Goggins: The Toughest Athlete On The Planet?