I've been called "crazy" and worse for crossing city, county, state and national boundaries--and mountain ranges--on my bike. And for working as a bike messenger in Manhattan. And riding on a velodrome.
But I admit there are some things I haven't tried, and don't plan to. I don't know whether I fear heights more than other people, but what these women are doing is above my pay grade.
They weren't doing a "one off" stunt. Rather, the contraption they're pedaling almost 1000 feet above Wansheng Ordovician Theme Park in China is an attraction open to the public.