“…External validity could also be improved by not only focusing on the level of PA at the immediate moment, but by focusing on a longitudinal follow-up of PA levels. Researchers are invited to use more objective types of PA measurements 78 coupled with more subjective tools (e.g., daily digital diary, 79 Indeed, the self-reported questionnaire has some limitations, particularly about accidental PA – referring to unplanned or unintentional physical activity resulting from everyday actions such as climbing stairs, gardening, cleaning the house or walking to do errands.…”