There is a difference between coming up with a new sport and getting enough individuals to actually engage in your sport. Well, below are some of the craziest extreme sports you never knew existed and have enough individuals/sponsors participating in them.

Get ready for your “Oh My God Moments”, because some of these sports are just individuals signing an early death wish, while others are just plain crazy!

1. Chess Boxing

When it comes to “Mind-Blowing” sports, it doesn’t get any more literal than Chessboxing. Chessboxing is a sport that puts both your Physical and mental abilities to test. You either checkmate your opponent or you physically knock him/her out!

Chessboxing is a hybrid fighting sport that combines chess and boxing. The competitors fight in alternating rounds of chess and boxing. Chessboxing was invented by Dutch performance artist Iepe Rubingh.

What was initially only thought to be an art performance quickly turned into a fully developed competitive sport. Chessboxing is particularly popular in Germany, Great Britain, India, and Russia.

2. Volcano Boarding

When you get really bored, these are the kind of ideas that come to mind! I guess if snowboarding is a big thing, why not the opposite?

Volcano Boarding/Surfing is a sport performed on volcano slopes. The most popular slope is the Cerro Negro, in western Nicaragua. Riders hike up the volcano and slide down, sitting or standing; reaching speeds up to 50 mph.

Now that is one “hell” of a ride!

3. Wing Walking

Wing Walking is an act of moving on the wings of an airplane during flight. Normally, the individual will be strapped to the top wing of the plane, where he/she will then be swept through the skies at speeds of up to 130 mph, with the pilot often performing a range of acrobatic stunts.

4. Mountain Unicycling (Muni)

While some people are still finding it hard to maintain their balance on a bicycle, we’ve got others going at speeds as high as 50 mph on a unicycle. Mountain unicycling is an adventure sport that consists of navigating rough terrain (similar to that of mountain biking) on a unicycle.

This should be the perfect sport for acrobats or those who just enjoy getting hurt.

5. Underwater Ice Hockey

I think we just found the new “Crazy”! Not only is this sport done underwater, it is played upside-down with no gas tanks.

Underwater Ice Hockey (also called Sub-aqua Ice Hockey) is a minor extreme sport that is a variant of Ice Hockey. It is played upside-down underneath frozen pools or ponds. Participants wear diving masks, fins, and wetsuits and use the underside of the frozen surface as the playing area for a floating puck. Competitors do not use any breathing apparatuses but instead surface for air every 30 seconds or so.

So what about the referee or the viewers? Hmm… It’s already making me dizzy thinking about it!

6. Cheese Rolling

Cheese Rolling is an annual event held on the Spring Bank Holiday at Cooper’s Hill, near Gloucester in England. It is traditionally done by and for the people who live in the local village of Brockworth, but now people from all over the world take part.

From the top of the hill a 9 lb round of Double Gloucester cheese is rolled, and competitors start racing down the hill after it. The first person over the finish line at the bottom of the hill wins the cheese. In theory, competitors are aiming to catch the cheese; however, it has a one-second head start and can reach speeds up to 70 mph (112 km/h), enough to knock over and injure a spectator.

The cheese had better be worth it at the end!

7. Skyaking

Skyaking is an extreme sport of skydiving in a kayak, so as to land on the water. Participants are required to perform as many stunts as possible in the air; while in the kayak.

Why don’t we try them all! Right?

8. Headis

The Headis is a typical example of turning challenges into opportunities. The sport was invented in 2006 by Rene Wegner, a Saarbrucken sports science student at the time. The idea came to mind when the soccer field was occupied, and some students started heading the ball back and forth at the table tennis table.

Headis is a mix of soccer and table tennis. The sport uses a similar table to that of table tennis; while a 7-inch rubber ball is used for game play using the head.

Because there aren’t enough sports already, in February 2010 Headis was one of the finalists of the world’s largest start-up competition in the sporting goods industry, the ISPO Brandnew Award from Munich.

Ok this one is not crazy, it’s just pretty cool.