I found it interesting that the drivers used similar voice commands. There was some use of the whip for sure but surely a lot of yelling to get the animals to run like that. I would be curious if they are saying similar words or if just the sounds are the same.
Humans have this innate sense of competition. Anytime there has been some free time from the business of feeding and sheltering ourselves we look to our neighbor and say hey I bet you my ox is faster than yours…. Wanna race?