Fitness habits formed in youth have a lifelong impact. Inactivity contributes to many health problems, including obesity, heart disease, and diabetes, as well as emotional problems, such as low self-esteem, and stress. Moderate to vigorous physical activity strengthens bones, muscles, the immune system, and helps control weight. Studies show a strong connection between physical activity and improved test scores. There are many effective alternatives to traditional team sports in school for those who, for whatever reason, can’t or don’t want to participate.