Zorb

Uneven plains that are interspersed with pebbles and rocks are likely to cause punctures in the zorbs.

There's even a kids' zorb for the under six.

An Interlaken entrepreneur […] came across the activity in the Swiss canton of Valais (the Rhone Valley) and ended up buying the 'zorbs' from a German manufacturer.

People who've zorbed in New Zealand, say Swiss mountains are too steep to allow the leisurely roll-out that's the real thrill.

We hadn't even zorbed. Not all bad news then.

Vieira zorbed — that is, rolled down a hill within an inflatable ball.