Since you said "motor racing sports", I'd say the FIM International Six Days Trials (now called "International Six Day Enduro" or "ISDE").
Link:
https://www.isde06.com/gallery.asp
This is like WRC except you're *waaay* more exposed and going just as fast.
I ran one SCCA Pro-Rally (the US version of the WRC) about 25 years ago in a 510. It was terrifying, but the bike enduros are even more scary.
The big bore ISDE bikes will do 130+ MPH at times, but they also have to snake through impossible landscape. The riders are super-athletes *and* racers.
I ran a junior version of ISDE (AMA East Coast Enduro Association) for nine years.
~ECEA site~
When I hit 40, I quit because it would take me at least two weeks to recover from each event. One of my local pals (Bruce Kenny) represented the USA in the Swedish ISDE in the 80s. He's the best rider I know, but he was second-string at the ISDE.
Running the
~DAKAR RALLY~ on a bike is probably a rough slog too (I'd love to run it in one of those big MAN trucks.
And of course, The Isle of Man TT Races is a fairly intense "commitment" (with all those stone walls).
Ditto, any form of aircraft aerobatics. /bcforum/images/%%GRAEMLIN_URL%%/wink.gif
The other end of the spectrum would be School Bus Racing /bcforum/images/%%GRAEMLIN_URL%%/grin.gif
ISDE-06-New Zealand