From Chile to Argentina on horsebackAs I lay shivering â€" despite my thermals â€" in the sleeping bag, with my water bottle frozen solid outside the tent, cream slapped on the sorest parts of my body and listening to the wind as it whipped through the campsite blowing away the makeshift lavatories, I asked myself, not for the first time, why I had ever agreed to ride a horse from the Pacific coast of Chile to the Atlantic coast of Argentina in the first place.