different between zorbing vs sphereing

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

sphereing (uncountable)

The practice of humans traveling in a sphere, generally made of transparent plastic, usually for fun.
- 2008, "Sphere we go again", in Body Confidential, Aug 4, 2008
  Well with sphereing, you are that sock - a prisoner inside a huge inflatable spherical jail, travelling down hills at speeds of up to 30mph

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