MAP to Health Pilot Study: A Physical Activity Intervention for Midlife Adults

In Phase 1, participants will complete the web-based interview and Aim 1 measures, assessing acceptability and usability of the intervention. The investigators will review whether the intervention appropriately gathers information needed to program theory-based, personalized text messages. After completing the measures, a list of text messages for that participant will be generated and sent to the participant for review. Participants will review the text messages and rate the extent to which the messages are personalized. In Phase 2, the investigators will conduct a proof-of-concept pilot trial in which participants will complete a 4-week pretest monitoring period and an 8-week pilot trial of the intervention, with assessments of Self-Determination Theory mechanisms and meaning salience at pretest (-4 weeks), baseline (0 weeks), midpoint (4 weeks) and posttest (8 weeks). In addition, participants will wear accelerometers to assess physical activity during the 12 weeks.