Running the Sahara

I rented this on Lovefilm.  It is a documentary about two americans and a taiwanese guy who ran across the Sahara, from West Africa to Egypt, taking around 100 days.  Needless to say there was a strong sense of madness behind their endeavour, given that it was very hot, there was lots of sand and sandstorms, and it was difficult to navigate.  More importantly was the question I kept asking myself:  why bother?  What will come next?  It is certainly not something that I will be putting top of my to do list for the future!