Gr 5-8–Indeed these books deliver the “hows and whys,” providing a solid foundation for understanding what happens to the body during and because of a particular exercise. Topics covered include health benefits, muscles and how they are affected, the body systems involved during activity, supplies, and the latest developments in the sport. Frequently asked questions are addressed (such as, in Weight Training, how much to lift). Though such a specialized focus has the danger of sounding like an infomercial, the books have a tone of authority gained by acknowledging the dangers of excessive behavior and discussing how to avoid injury. Additionally, every book encourages seeking professional guidance, whether from gym employees, a bike-shop assistant, coach, or swimming instructor.