To grow a healthy boy, you need to know—or understand—the laws of age-related physiology: that is, when and in what quantity you should give exercise to a growing child’s body so that he grows correctly, in accordance with his anthropometrics. If a child simply grows like weeds in a garden and parents don’t monitor his physical development (up to 6–8 years), there is a high chance that the young man will be rejected for military service, and also a high chance that he will turn out to be infertile. It’s impossible to catch up on what was missed in early childhood at a later stage of life (after the end of the puberty period). Physiologists call this phenomenon retardation. Adult men should also read the author’s original concept about prostatitis and hemorrhoids. Practice has proven its feasibility.