>>653981Anon that you replied here, to be honest my father did the same thing to me far ago. One day, i've traded his bike (He stopped riding it) For an bmx (I was 16 at the time, 1,73cm) and learned it myself.
I've looked fucking ridiculous bc i couldn't even stand on the bike, but months of training (and some bruises) made me learn. Never got too bad injured, i was a fucking pussy and always waited weeks before trying a new trick.
Then... I've discovered another kinds of bikes. Today i'm full-dirt, there are alot of Bike Groups where i live and they go together every week to trails and all.
Teach your soon to go dirt, try to find some cool bike groups in your city, he will get friends and an sport.
If he continues, however, prepare your wallet. Changing parts, equipment, that shit is fucking expensive.
Sorry for bad english, good luck.
>>654031 is right, Dirt is the way.