I'll be honest and say I didn't follow the back half too closely. Is it the author's intent to say that parkour is purely viral in it's transmission from perso

I'll be honest and say I didn't follow the back half too closely. Is it the author's intent to say that parkour is purely viral in it's transmission from person to person? I would think any child left on a jungle gym (outdoor playset if the term's regional) for more than 5 minutes would be attempting the same thing without prompting, at least to their own abilities. The human mind likes to problem solve and find shortcuts, parkour is an extension of that.