Our society is facing a health crisis. Sedentary lifestyles, poor nutrition, and overcommitted schedules have led to obesity, chronic disease, elevated stress, and a host of other health problems for large segments of the population. The recent publication of the U.S. Health and Human Services Physical Activity Guidelines and launch of the National Physical Activity Plan have brought much-needed attention to these issues. These documents offer a road map for those working to promote healthier lifestyle choices, but it can be difficult to turn the guidelines into programs that appeal to...