Prolonged total sitting time and domain-specific sedentary behaviors, particularly sitting watching television, have been associated with increased risk of obesity,
1 cardiovascular disease,
2 cancer,
3 diabetes,
4 and overall mortality.
5 Physical activity eliminates the excess risk associated with prolonged sitting only among highly active individuals (ie, 10-11 h/wk of brisk walking),
6 leaving the majority of the US population who are inactive or who merely participate in the recommended amount of physical activity
7 at higher risk of mortality associated with sitting. Indeed, the second edition of the seminal 10-year update of the
Physical Activity Guidelines for Americans8 not only acknowledged the health risks associated with sedentary behaviors but also, for the first time suggested that most people would benefit from both increasing moderate to vigorous physical activity and reducing time spent sitting.
9