This is a fun article with great climbing advice from Jonathan Vaughters. It's so true how kids like to climb anything and everything. Same holds true for my son. When he was less than 1 year old he managed to climb out of his crib. I always used to climb trees as a kid too. It hasn't been until recently that I enjoy suffering up climbs on my bike. As one reader said in the comments, the climbs are hell, but the feeling you get when you reach the top is unreal!
Expert Advice From Jonathan Vaughters - The Climb - Play Magazine - Tour de France - New York Times Blog