Well some say that its a sign that they have finally flipped out but Michael and Samantha have signed up to climb Mount Kilimanjaro in August 2013.  Plenty of time for training and they are making the most of it.  See their blog at http://kili2013.com to see how they are getting on, find out more information about their chosen charities and maybe even donate a little to encourage them!  All donations are very very much appreciated.