The Winter X Games were expanded this year to include Aspen and Tignes, France.

CNN: STORY HIGHLIGHTS

Moore's injury is one of several at this year's Winter X Games.

CNN: STORY HIGHLIGHTS

Shaun White, who says he used to tape old cameras to his hand, used GoPros on his runs during the Winter X Games.

FORBES: The Mad Billionaire Behind GoPro: The World's Hottest Camera Company

Burke is a four-time Winter X Games champion in skiing the superpipe, a version of a traditional halfpipe with walls over 5m (16ft) high.

BBC: Canada freestyle skier Sarah Burke in coma after crash

Moore, a freestyle snowmobiler, was attempting a backflip at the Winter X Games in Aspen, Colorado, when he couldn't rotate his machine enough to land properly.

CNN: Snowmobiler Caleb Moore dies a week after crash

Freestyle snowmobiler Caleb Moore, attempting a backflip with his snowmobile at the Winter X Games in Aspen, Colorado, couldn't rotate his machine enough to land the maneuver.

CNN: STORY HIGHLIGHTS

He started sweeping out the shaping room of a surf shack as a kid and worked his way through the industry, eventually becoming an on-air announcer for the Winter X Games from 1996 through 2005.

FORBES: Who Was 'That Guy' at the Jerry Buss Memorial? Family Friend Greg Tomlinson Tells His Story

Consider that when freestyle skier Sarah Burke died while training for the 2012 Winter X Games, her contemporaries honored her memory by throwing down stunts in a halfpipe just like the one that caused her death.

FORBES: X Games To Cancel Snowmobile Freestyle Event Following Caleb Moore's Death

This month a mob of 250 youngsters, many of them sporting baggy clothes, multicolored hairdos and multiple piercings, will invade the refined Aspen Mountain resort to appear at the Winter X Games, part of ESPN's twice-yearly "extreme sports" lollapalooza.

FORBES: X-treme Economics

But I'd be lying if I said the X-Games and the Winter Olympics weren't an ambition of mine.

BBC: SPORT | Other Sport | Skiing | Wakefield wins half-pipe