A snowmobiler is fatally injured during practice . The freestyle snowmobiler , attempting a backflip last week at the Winter X Games in Aspen , Colorado , could n't rotate his machine enough to land the maneuver . Questions are raised over safety . ESPN says it has worked to improve athlete and spectator safety .
A snowmobiler is fatally injured during practice . Questions are raised over safety . ESPN says it has worked to improve athlete and spectator safety .