I'm a huge fan of extreme sports and the X-Games series. Watching people pull double (and now triple) backflips on motorcyles and insane skateboard tricks is something I could do for hours.

I welcome you to Icecross Downhill ice skating. As you can see from the massive crowds at the events, it's obviously hugely popular. Basically, take a downhill skiing course, put it on pure ice with speed skates and you have Icecross.

These guys reach insane speeds and skate huge courses with dangerous obstacles littering the entire run. While I would never try to do this, I would totally watch this all day long.