May I suggest we invent a MTB version of radball called gnarball?
You may, but you'll find others who wish only to practice a specific discipline of gnarlball:
jey-gnarlball – only done wearing lycra and very fast
free-lite-core-gnarlball – a derivation of the original free-gnarlball, which came from Canada, and involves specific features, like "Pass it square, eh!"
single-gnarball – played only by those with beards, usually to the sound of exploding knee joints
IT-helpdesk-gnarlball – played exclusively by middle-aged guys working in IT, but only when their wives let them
Most gnarlball, however, would only actually be discussed (and not practised) on gnarlballworld
😀