I had no idea that skiing was an extreme sport. I'm quite sure that in Switzerland it is considered risky only if you go off the marked and maintained slopes.

I've tried skiing, rock climbing, rafting, surfing (once) and I'd like to try wind surfing.

Swimming. Thank god I am alive!

I can never forget that day nor will take any stupid attempt to do it again!! 

Hi, when me and my brother were children, we used to scuba-dive a lot as we searched for Sea urchins, and we also made "dive competitions" the one who reaches the deepest. We didn't fear a lot a moderate strong sea; and as we usually went on cliffs(not on seasides), we also learned to dip from quite high cliffs. That's not very extreme for adults but we were quite audacious as children; and at our house, we also used to go playing on a steep garage slope with skateboard and rollers -- and that was really crazy, I don't know how could we do that.

Besides, I think I'm very trivial if I say that I would like to parachute, but in this case I wonder if I could ever try Wingsuit (https://goo.gl/DXMEue); Mountain climbing is nice as well, but I don't know if my few hard survival experiences count as "sport": hard mountain is fantastic and changes a man inside.

... Bully spoiled vicious dreams -- would say those who tried the most extreme sport humans have ever invented. In that case, I hope I can always have toothpaste and soap.