Self-Determination Theory-informed Occupational Therapy Program to Increase Physical Activity Among Survivors of Breast Cancer

Inclusion Criteria: 1. ≥18 years old. 2. Ability to speak/read English. 3. Ability to provide informed consent. 4. Having ever received a histologically confirmed diagnosis of invasive breast carcinoma. 5. Having undergone breast conserving surgery or mastectomy for BC in the last 12 months. 6. Owning a smartphone and/or computer with internet access. 7. Willing to participate in once-weekly telehealth-delivered OT sessions for eight weeks. Exclusion Criteria: 1. Currently undergoing chemotherapy or radiation as primary cancer treatment. 2. Planning or preparing for surgery as primary treatment or as a reconstruction procedure in the next 3 months. 3. Presence of distant metastasis. 4. Reporting a Physical Activity Readiness Questionnaire (2017 PAR-Q+) score that indicates PA may potentially be unsafe, unless the participant produces a signed doctor's note. We will define 2017 PAR-Q+ scores as indicating that PA may potentially be unsafe as responding "Yes" to any of the follow-up questions except \[1\] if the individual indicates that they have high blood pressure but subsequent responses indicate that both they do not have problems keeping it under control and that their resting blood pressure is less than 160/90 mmHg, and \[2\] if the individual indicates that they have a metabolic condition but subsequent responses indicate that they do not have problems controlling their blood sugar levels, do not any experience signs or symptoms of hypoglycemia, and do not have any signs of symptoms of listed diabetes complications). 5. Already engaging in ≥ 75 min/week of vigorous-intensity PA, ≥ 150 min/week of moderate-intensity PA, or an equivalent combination of both over the last 3 months. 6. Being a prisoner, pregnant, or planning to become pregnant. 7. Currently participating in another PA- or OT-based study, or seeking physical therapy or occupational therapy treatment.