Skateboarding will be included in the next Olympics
That would be cool. Something different.
My favorite skateboarder is Rodney Mullen. Do you have a favorite skateboarder?
No, I don't know much about it. The only one I'm familiar with is Tony Hawk. My son is a skater.
Rodney Mullen invented many of the most common tricks, probably some of the ones your son does now.
Probably. Skating takes an amazing amount of skill. I've tried a few times and don't do very well.
Some of the tricks are very difficult, but there are easier tricks that can be done by almost anyone.
What I would really love to try is one of those huge boards down a hill. I forgot what they call that kind of skating. No tricks just riding the skate board.
I'm not sure what they are called either, but they do look fun. 
https://www.youtube.com/watch?v=XpLBH7icckk