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The Internal qi training is similar in progression as mo pai (if used correctly). The instructions are clear and a variety of hitting techniques are used. It's a very straight forward book on iron palm that actually contains training methods without a ton of talk. It's a instruction manual and a complete course in a 112 page book. Only thing it lacks is combat techniques but thats not really what this book is about.
It’s okay as a book. It could do with a bit more detail and explanation but it is an interesting read. The author does seem to have a chip on his shoulder towards the western world which spoils it in my opinion. In the western world there is a little known art of gently slapping anvils and soaking hands in brine to make the hands so tough that you can use your hands to hammer nails into wood. There was also the old tradition of bone strengthening in the western world. If one of these shall Kung fu experts fought someone like Bartley Gorman or Jack Dempsey then I doubt they would win. The Bartley Gorman from the 1800’s fought in fights with no rules and no protective gear. It was the horrific injuries and deaths from the fight in this period that resulted in the creation of rules. Kung fu does not have the monopoly on conditioning the body. The author should be a bit more respectful to other traditions and arts.