These are both totally crazy and surprisingly common. The footage is awesome.

Music by Marik Production:
http://soundcloud.com/marikproduction

Sports featured (along with sources of info):

Kite Flying
http://usatoday30.usatoday.com/news/w...
http://www.breakingnews.ie/world/paki...
http://www.environmentalgraffiti.com/...
http://latitude.blogs.nytimes.com/201...
http://en.wikipedia.org/wiki/Vasanta_...

Cheerleading
http://www.nytimes.com/2007/03/31/spo...
http://abcnews.go.com/Nightline/cheer...

Equestrian
http://www.cdc.gov/mmwr/preview/mmwrh...
http://www.cdc.gov/mmwr/pdf/wk/mm6039...
http://www.aans.org/Patient%20Informa...

Cave Diving
http://www.forbes.com/2002/08/07/0807...

Base Jumping
http://en.wikipedia.org/wiki/BASE_jum...

Train Surfing
http://en.wikipedia.org/wiki/Train_su...
http://www.urbanghostsmedia.com/2013/...

Heli-skiing
http://en.wikipedia.org/wiki/Heliskiing

Footage featured in this video from...

Jonathan Jennings
http://vimeo.com/64514476

Big Fish School
http://vimeo.com/17580597

Marco L. Regina
http://vimeo.com/54253532

CG IV
http://vimeo.com/31125235

StormchaserVT
http://vimeo.com/61506550

WOA
http://vimeo.com/48161982

Lydia Semenov
http://vimeo.com/22216277

生米熟飯 Rice Production
http://vimeo.com/49168174