 In the first 10 days following recruitment, participants met with the research coordinator and were provided with an accelerometer GT3X and completed self-report baseline measures. Provided along with the RiseTx application is the Jawbone, which is a wrist-worn device that can assess activity patterns throughout the day and provide sensory alerts to stand after prolonged sitting i.e., 30 minutes of sedentary time. The intervention consisted of five phases following initial data collection, including a baseline phase weeks 1-2 where participants self-monitored their typical leisure time PA i.e., step counts and were asked to sync their Jawbone with the RiseTx application to view their daily progress and steps. This daily self-monitoring process continued over the remaining intervention period. Based on a previously tested ramped step count approach that focuses on increasing walking by an extra 1000 daily steps over a set period, participants attempted to increase daily steps by 1000 over the average of their baseline week. Phases I-III involved progressive release of self-regulatory strategies e.g., action planning on the application and targeted changes in both sitting time and breaks in sitting time and step counts. Phase I weeks 3-4 focused on increasing low intensity, incidental movement, through the use of an alerting device, and the Jawbone reminder to break SED. At this time, an additional 1000 daily step increment was set above baseline. Phase II weeks 5-6 targeted shorter planned PA of up to 10 mins by having participants form action plans on the application for both reducing SED and increasing PA. An additional 1000 daily step increment was set above Phase I. Phase III weeks 7-8 focused on promoting longer, moderate intensity PA 10 min, where participants used the application to form coping plans for barriers to reducing sitting time or engaging in PA. An additional 1000 daily step increment was set above Phase II step target. A 4-week consolidation phase Phase IV and V; weeks 9-12 followed, where participants received weekly reminders that encouraged them to continue to use the RiseTx application to practice combining the different self-regulatory strategies learned in Phases I-III. Following the intervention, there was a 12-week maintenance period weeks 13-24 where participants no longer received weekly self-regulatory practice reminders, yet still had access to the application. 