I’m not generally a fan of stunts like Felix Baumgartner’s skydiving record. Despite whatever efforts were made to make it sound like an athletic feat, it was basically a test of his safety equipment. If it worked, he lived, and if it failed he didn’t. The role of Felix Baumgartner could have been played just as well by a mannequin https://valtabs.com with a gyroscope in it. Bungee jumping is pretty much the same thing, manufactured thrills for the serotoninally challenged.

Dirk Auer, though, may be in a different category.

He designed and built the skates himself.

He went 90kph (56mph, Americans).

If his quadriceps had weakened, he presumably would have died.