Extreme Races

It seems that every time you turn around these days you find out about another extreme race that is more extreme than the last. The Europeans seem to have it all over US for organizing insane events- case in point:<br><br><a href="http://www.theextraordinary.co.uk/ultra/marathon_des_sables/index.html" target="_blank">http://www.theextraordinary.co.uk/ul...les/index.html</a><br><br>
Has anyone here actually participated in the Marathon des Sables?<br><br>
That's insane. After doing the Grand Canyon double crossing a couple of years ago I decided that marathons were enough. <img alt="biggrin.gif" src="http://files.kickrunners.com/smilies/biggrin.gif">