This document discusses physical fitness and its importance, especially for children. It provides ways to implement fitness such as walking, running, swimming and sports. The document notes that childhood obesity has increased over the last 20 years and discusses causes such as poor eating habits and lack of exercise. Risks of childhood obesity include increased risk of heart disease, diabetes and breathing problems. The document provides tips for preventing childhood obesity through changing eating habits, increasing physical activity, and limiting snacking. It also provides instructions for exercises like sit-ups, push-ups, pull-ups and modified versions for children.