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> so is volleyball

Is it? I've never played volleyball and I never met anyone who had until I moved to my current country.

> Both are sports for rich (countries) only. How many tennis players you know are from Africa?

Fair, but that's a little different from "regional".

> Is it? I've never played volleyball

See, I've never played basketball or golf.

> Fair, but that's a little different from "regional".

"regional" is very vague. The point is that these sports are far from global.