It has been suggested that adults spend between 6–10 hours sitting each day . Recent data has highlighted that for the majority of working adults, time spent sitting during the working day is more likely to contribute to overall time spent sitting than the time spent sitting during leisure time . Examining sitting time during the working week compared to at weekends could provide additional insight into the links with mental health and well-being, particularly in employees. It could be suggested that there may be different effects of weekday and weekend day sitting due to the lack of volition individuals have over their sitting behaviours within the workplace, in comparison to their leisure time. Current proposed mechanisms as to why engaging in prolonged periods of sedentary behavior could lead to poorer mental health include: i) the social withdrawal hypothesis  ii) the time displacement hypothesis  and iii) the involvement of inflammatory markers . The majority of cross-sectional evidence suggests that watching TV is associated with poorer mental health  yet the evidence for other sedentary behaviors, for example computer use, is mixed and it has been argued that the association with mental health is often dependent on the purpose and content of the computer use . Longitudinal evidence has shown that engaging in more TV watching and computer use at baseline predicts a greater risk of depression at follow-up  and that depressive symptoms at baseline are predictive of more TV viewing at follow-up . A recent meta-analysis examining sedentary behavior and the risk of depression across 13 cross-sectional and 11 longitudinal studies  suggested that different types of sedentary activities may have differing associations with mental health.