Freestyle Powerizer Stilts are tools used in some new “extreme sport”. Swebounce.com (related to one of the persons in the video) describes the phenomenon as follows:

“Powerisers are bouncy stilts that you strap yourself into. With some training you can run as fast as 20mph and jump 2 meters high. For many people it’s enough to just run around and bounce but there are many kind of tricks you can perform on powerisers. I would say that this is the extreme sport of the future.”

See also: hemoves.com, a site of one of the performers.

[via:Matt Heaton]