Physical Activity during the First Lockdown of the COVID-19 Pandemic: Investigating the Reliance on Digital Technologies, Perceived Benefits, Barriers and the Impact of Affect, Symons, Michelle, Cunha Carmem Meira, Poels Karolien, Vandebosch Heidi, Dens Nathalie, and Cutello Clara A. , International Journal of Environmental Research and Public Health, Jan-06-2021, Volume 18, Issue 11, (2021)