William Martin's book "The Book of Sports" is a thorough reference for all kinds of sports and exercise. Each chapter of the book is devoted to a particular sport, such as basketball, soccer, football, tennis, golf, and many more. Each sport is thoroughly covered by the author, including its background, regulations, and tactics. He also provides helpful guidance on methods, instruction, and tools. Both novice and experienced athletes can easily understand the material in the book. Martin covers team sports as well as individual ones. He also talks about the value of total physical health and offers advice on strength training, diet, and injury avoidance. He places a strong emphasis on the advantages of exercise and sports for both physical and mental health.