It is a pretty readable book on exercises: the myth and the science of it, like the two sides of a coin. If one wants to get one sentence out of this book is - Exercise is very important and we should all exercise, both cardio and strength. There is no fixed dose for all people. The author compares our ancestors‘ busy lifestyle - the need to hunt for food and escape from the danger has already "forced" them to exercise already. We modern human being have to go to gym or buy dumbbell to workout at home in 2020. Do no ponder over what kind of exercises are the best. HIIT, cardio, aerobatic, strength, resistance training and other types are all beneficial. The point is to get move!!!