""Plain Rules For Improving The Health Of The Delicate, Preserving The Health Of The Strong, And Prolonging The Life Of All"" is a book written by William Henderson in 1831. The book is a comprehensive guide to improving one's health and prolonging life, and it is written in a simple and easy-to-understand manner.The book covers various topics related to health, including diet, exercise, hygiene, sleep, and mental health. It provides practical advice...