Meyer, J., McDowell, C., Lansing, J., Brower, C., Smith, L., Tully, M., & Herring, M. (2020). Changes in                             physical activity and sedentary behavior in response to covid-19 and their associations with                         mental health in 3052 US adults. International Journal of Environmental Research and Public                       Health, 17(18), 6469. https://doi.org/10.3390/ijerph17186469