Red Bull X-Alps 2013.

The 2013 Red Bull X-Alps will be the sixth edition of the world’s toughest adventure race. Athletes must either hike or fly over 100 km across the Alps from Salzburg to Monaco in the fastest time possible. Every kilometer must be covered either on foot or flown in a paraglider. It’s a formidable undertaking and takes place in one of the most breathtaking yet also unforgiving environments.