The document discusses several topics related to exercise and health. It provides background on body mass index and how it is used to define weight categories. It also discusses issues contributing to childhood obesity like increased fast food consumption, sedentary lifestyles, and reductions in physical education classes. The document outlines some of the health risks of obesity like diabetes and low self-esteem. It also discusses efforts to increase physical activity for children through new school programs, active video games, and daily gym class requirements. Finally, it provides an overview of different types of exercises like cardio, strength training, yoga and their associated health benefits.