This passage is a book about diet and fitness. The author opens the chapter by highlighting the value of warming up before any exercise, and then she presents the idea of nourishment. The author states that nutrition is a study of the nutrients found in food. We eat and how those nutrients influence and support the body. Nutrition is the process by which organisms ingest organic material to exist. The chapter also defines words like nutrition, diet, calories, metabolism, and physical fitness throughout the book. Physical fitness, according to the author, is a condition of total health and well-being that includes the capacity to engage in physical activities, compete in athletic events, and respond to and tolerate