Empowered With Movement to Prevent Obesity and Weight Regain

All participants will undergo a dietary WL intervention designed to elicit behavioral changes leading to decreased caloric intake sufficient to yield a \~10% loss of initial body mass. The WL intervention includes nutrition education, state-of-the-art behavioral methods for promoting WL, and strategies that optimize self-regulation.

Perform structured aerobic exercise (mostly treadmill walking) of moderate-intensity for 4-5 days/week, progressing to a duration of 200 min/week. Participants will attend center-based sessions for at least 3 days/week during the first intensive 6-month phase and at least one day/week during the second 3-month transition phase (months 7-9), with recording of home-based exercise for the other 2-4 days/week.

Encouraged and taught to reduce sedentary behavior (SB) during waking hours. The SitLess treatment targets increases in postural shifts and light, spontaneous physical activity (SPA) (MET level \<3).