What is the theme in A Rock and a Hard Place by Aron Ralston?

Survival is a major theme in the book. Undoubtedly, Ralston's story of becoming trapped in Blue John Canyon and surviving for six days with little water and food only to amputate his arm and hike out of the canyon for help is an incredible testament to the will to survive. Ralston's experience with survival is not limited to his most dramatic tale, however. He escapes a hungry bear by aggressively challenging the bear, not a recommended way to deal with a bear.