Because public parks contribute to health and well-being, primarily by serving as an important venue for physical activity, it is in the best interests of park administrators to have a method to measure this contribution. Physical activity is one of the most important routine behaviors that reduces chronic diseases and improves health outcomes for all age groups. Nearly 11 percent of all deaths and a significant proportion of chronic conditions, including heart disease, diabetes, and cancer, among Americans are directly attributable to physical inactivity. While parks offer health benefits beyond physical activity, physical activity can be objectively measured and is...