Watchful Living in Improving Quality of Life in Participants With Localized Prostate Cancer on Active Surveillance and Their Partners

Inclusion Criteria: * Self-identify as black or African American or Hispanic (patient) * Be greater than 18 years of age (patient and spouse or intimate partner) * Have 0-III stage prostate cancer (patient) * If treated, have completed therapy (e.g., surgery, chemo and/or radiation) (patient) * Enroll with a spouse or intimate partner (patient) * Do not meet physical activity recommendation (i.e., 150 minutes of moderate intensity physical activity per week) (patient and spouse or intimate partner) * Be ready and able to be physically active, as determined by a physician (letter from a physician or nurse practitioner) (patient and spouse or intimate partner) * Not participate in another physical activity, diet, or lifestyle program (patient) * Have a valid home address and telephone number (patient) * Internet access at home or other location (e.g., work, church, library, community center, etc.) (spouse or intimate partner) * Patients on active surveillance will be included Exclusion Criteria: * They have an active noncutaneous malignancy at any site (patient) * Had prior radiation therapy for treatment of the primary tumor (patient) * Have planned concomitant immunotherapy, hormonal therapy, chemotherapy, or radiation therapy during the study period (patient) * Are enrolled in another active surveillance protocol (patient) * Participated in formative focus groups for this study (patient and spouse or intimate partner)