different between zorbing vs sphering

English

zorb +? -ing

zorbing (uncountable)

(originally New Zealand) A sport in which a participant is secured inside a zorb and rolled downhill.

zorbing

sphere +? -ing

sphering (uncountable)

The practice of humans traveling in a sphere, generally made of transparent plastic, usually for fun.
- 2001, "Your fool-proof guide to buying the perfect Christmas presents", in Daily Post, Dec 13, 2001
  The gift set contains a video and a voucher entitling them to go either snowboarding, sphering, jet skiing or rapid running for pounds 85.

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