Output of prediction equations demonstrating the influence of theoretical changes in sedentary time, from decreasing by 1.5 h to increasing by 1.5 h in 30 min increments, (represented by bars) on changes in mood (Panel A), stress (Panel B), and sleep duration (Panel C). To illustrate the cumulative influence of baseline sedentary time combined with changes in this behavior, predictions are broken down based on baseline levels of sedentary time in subgroups (<10.5, 10.5–12, >12 h/day). This shows that greater baseline sedentary time predicts somewhat worse mental wellbeing and shorter sleep one year later, but that changes in sedentary time over the year have the potential to overcome or exacerbate the predicted changes in mental wellbeing and sleep at the end of the year. Data were collected between 2011 and 2013 in Columbia, SC.