Observation 2: Physical Development Adolescent years are one healthiest times in life span. In America exercise and eating healthy play a huge role in health. It is critical to adopt certain behaviors relative to health. 20% of Americans are overweight and 5% are obese and the stats continue to increase due to poor eating habits and not many people exercising. Miley isn’t shown eating healthy, but in some episodes she is shown working out. She does get exercise by performing.