Physical inactivity is one of the leading “actual” causes of preventable premature mortality due in large part to its role in obesity and associated morbidities. Currently, less than half (47%) of U.S. adults meet recommendations for aerobic physical activity. For children the numbers are also low, 29% of high school students reported meeting the goal of 60 minutes of daily physical activity over the last week. There has also been a decline in the proportion of children walking or biking to school from 48% in 1969 to 13% in 2009. As a result, promoting physical activity both as recreational exercise and as a part of day-to-day utilitarian travel by foot or bicycle has emerged as a central goal of national and international efforts, often as part of obesity prevention and control efforts.