How did the COVID-19 confinement period affect our physical activity level and sedentary behaviors? Methodology and first results from the french national ONAPS survey - Genin, P. M.; Lambert, C.; Larras, B.; Pereira, B.; Toussaint, J. F.; Baker, J. S.; Tremblay, A.; Thivel, D.; Duclos, M. (Journal of Physical Activity and Health, 2021)