This is a great book about what it takes to "grow young", rather than growing old. It's written by a young physician and his older patient. After repeated discussions on the importance of exercise as part of daily life, the author decides to "flip the switch", and gets into the mindset that he's going to "fight the tide" (of aging).
The book is very well written and a quick read. Being a physician myself and always harping on my patients on the importance of "the two ugly words" (diet, exercise), the book really struck a chord with me. When they read it, my patients receive firsthand testimony that finding inspiration to exercise really does pay off.
I encourage all of my patients to take the time to read the book because it contains powerful lessons, especially for those over 50.