Found this to be a very interesting video. Probably be cause I am a little older than I use to be...and because I have been fighting my own health issues.
Anyway, it is a good video...even if you have no interest in dirt riding;
BTW, it is only 20-30 minutes long...not 2 or 3 hours long. ;)
That is freakin' awesome!! I sure hope to be riding with some of you crazy folks in 50 years!!