Experimental: PP-MI Intervention

Participants will receive a 12-week, Positive Psychology-Motivational Interviewing (PP-MI) intervention. Each week, participants will complete a PP activity and work towards one or more health behavior goals, then complete a phone session with a study trainer. Each weekly session will include PP and goal setting portions. In the PP portion, a study trainer will (a) review the week's PP exercise, (b) discuss the rationale of the next week's PP exercise through a guided review of the PP-MI manual, and (c) assign the next week's PP exercise. Additionally for the goal-setting portion, the trainer will (a) review their goals and health behaviors from the prior week, (b) discuss techniques for improving health behavior adherence (e.g., monitoring physical activity, reading nutrition labels), and (c) set goals for the next week. Finally, participants will receive supplemental text messages throughout the 12 weeks of the intervention and during the initial follow-up period (Week 13-24).

Active_comparator: MI-alone Intervention

This condition will mirror the MI component of the PP-MI intervention. During the first three sessions, participants will learn about the causes and types of HF, risk factors for cardiovascular disease, and methods for monitoring risk factors and symptoms. Then participants will complete nine sessions related to physical activity, a low sodium diet, and medication adherence. Weekly tasks (e.g., brainstorming barriers) will be assigned, completed between calls, and reviewed at the following call. Finally, participants will receive supplemental text messages throughout the 12 weeks of the intervention and during the initial follow-up period (Week 13-24).