I appreciate extreme sports from a distance — I think they’re thrilling to watch and I admire the athletes’ skill and courage! But as for participating? I’ve stuck to tamer adventures like hiking, rock climbing (indoors, safely harnessed!), and maybe a slightly too-fast bike ride down a hill. 😅
That said, some extreme sports I find especially fascinating:
· Rock climbing / Free soloing (though free soloing is beyond extreme — huge respect but major risk)
· Snowboarding / Big mountain skiing
· Skydiving or BASE jumping
· White-water rafting or kayaking
· Mountain biking (downhill trails especially)
I don’t know if it’s extreme, but I’ve bungee jumped from a platform in Florida when I was on vacation, I’ve also done sky coasters. 
I sure consider bunjee jumping extreme. You won’t catch me doing it. What is sky coaster? It is not clear to me from the picture.

Sounds exciting, but you won’t catch me doing it!