Cognitive variables
We asked two statements concerning beliefs about sit- ting: ‘Sitting for long periods does not matter to me’ and
‘When I sit for hours, I feel uncomfortable’. As response categories, we used a five-point (one to five) rating scale (strongly agree to strongly disagree). To ensure that all items with higher scores would indicate more positive attitudes towards sitting, we recoded the item ‘Sitting for long periods does not matter to me’. The items were developed specifically for this study and were tested for psychometric properties using a standard pilot test.