Comedian Des Clarke cannot swim, cannot drive and cannot ride a bicycle - but for Sport Relief he is going to try to do all these things and compete in three very special Tryathlons. Joined by a team of celebrity supporters, including Sir Chris Hoy and Strictly Come Dancing's Susan Calman and Joe McFadden - Des travels to Scotland, and amongst his many challenges attempts to swim Loch Ness, cycle the Forth Bridge and drive to the top of a mountain with Top Gear's Rory Reid. No easy tasks for a man who can't swim, cycle or drive. Will Des Clarke complete his challenges? Will he conquer his fears?