"I had a copy of this book many years ago when I was involved in marathon canoe and kayak racing. It was worth every penny I spent on it. I was 35 years old at the time. I have now just completed 28 years in prison, I'm 70 years old now and plan on getting into canoe racing again, power-lifting, and mountain bike racing; since the world has changed in a positive way. They now have age categories in many sport's competitions. Therefore, I no longer have to be concerned about competing against people a lot younger than me - the way it used to be. As soon as possible I will be getting another copy of this book. I highly recommend this book to anyone wishing to get a "natural" edge on their competition!"