If you are interested in cycling at any level this is a very good book. If you are about to buy a bike it has constructive non commercially orientated advice, if you are a keen club cyclist it is stacked with practical non commercialised advice. He points out simple things that the manufacturers ad men might have you believe no longer apply, for example "the laws of physics have not changed" and on aerodynamics and materials for frame design (I won't say which material he refers to here "...they tend to be very blobby". Written in a style that is down to earth and comprehendable Graham Obree has achieved something here that few training manuals achieve, accessible and understandable information to the non medically trained reader and I guess of great interest to the medically trained.
The book is written from a base of knowledge and experience that few can rival and the best part for me is he clearly has no agenda to sell. He just wants to add value to your cycling experience whether you are a cyclist or an armchair fan or someone who wants to learn more about the subject.