Inclusion Criteria:  Participants who are caregivers for a family member (e.g., relative, spouse, friend) who is 65 years or older and is either frail, has a disability, or has at least one chronic illness 40 years or older Own an Android smartphone with Google play store/internet access Able to walk for at least 20 minutes at a time Comfortable wearing a fitness tracker for the duration of the study Familiar with smartphone app usages Comfortable with using the study-related app for the duration of the study  Exclusion Criteria:  Had a recent (within the past 6 months) cardiovascular event or fall. Currently participating in any other physical activity study/intervention Currently own or use a Fitbit or other activity tracking watches Knows someone who is participating or has participated in the study Currently physically active (exercise regularly 3 times a week or more for at least 30 minutes) More than 2 errors on the Short Portable Mental Status Questionnaire (Pfeiffer, 1975).