Digital Health Physical Activity Program for Older Family Care Partners of Patents With Heart Failure

Inclusion Criteria: * Age greater than or equal to 50 years * Involved in caring for a household member aged 50 years or older with the New York Heart Association Class II, III or IV HF * Provide at least 8 hours/week of unpaid care for the past 3 months * Physically able to engage in structured exercise such as walking, and upper body resistance exercises * Engage in \< 30 min of moderate-intensity exercise on fewer than 3 days per week * Able to read, speak, and comprehend 5th grade English * Own a smartphone * Reachable by telephone, text messaging, and email * Have a 6x6ft space fit for physical activity in the place of residence Exclusion Criteria: * Medical or functional conditions precluding participation in the physical activity (PA) components of the intervention (e.g., inability to walk one block or climb stairs without chest pain, shortness of breath, dizziness; history of falls; or serious or unstable cardiovascular or pulmonary disease) * Cognitive impairment (Telephone Interview for Cognitive Status \[TICS\] score \< 25) * Inability to use technology * Participation in a PA intervention in the previous 6 months * Current participation in a PA or behavior change trial * Physical activity unpreparedness ('Yes' to any questions 1-4 the Physical Activity Readiness Questionnaire \[PAR-Q\]. If participants respond 'yes' to any questions 5-7, we will ask follow-up questions.)