I like David McCollough's biographies, and I think I have like this one best of all. It is about the early days of Teddy Roosevelt. The author tries to answer the question, "How did this extraordinary man become who he was?"
He shows the influences of his family, his poor health as a young man and how he just loved the natural world. These elements shaped Teddy and inevitably shaped our country. He believed in a very physical lifestyle, hence the title of the book.
The book was fascinating throughout, and if you like history and are interested in Roosevelt, I highly recommend it.