The 18-year old will build physical strength from this, which will carry him well into his later years. His bones and muscles will build up a density that will serve him well, much like my Grandfather. He worked his teen years on the railroad, assisted his father in a blacksmith shop, later worked as a shipbuilder and auto mechanic. He lived 96 good, strong, healthy years, thanks in no small part to the strength he built in his formative years.
For this young man, there will be a star in his crown!