Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
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.