In London there’s a place called Circus Space which does classes for people of all ages to learn circus skills — some people from LISPA went there to get better at acrobatics. Maybe there’s something similar in your area?
Do you know about Parkour? Look for videos on YouTube — it sounds like the kind of thing that would interest him. I saw a kid his sort of age calmly showing off to crowds on London’s South Bank not long ago by suddenly running up to trees and doing back flips off them. There must be groups and things in NY devoted to it.
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