Inclusion Criteria:  35 to 65 years of age BMI between 30.0 and 50.0 kg/m2 Able to read and write English Home access to the internet via computer or smart phone Ability to walk 10 consecutive min without assistance Currently performing <50 min/week of moderate intensity physical activity per week (verified via an accelerometer)  Exclusion Criteria:  Current participation in another formal weight management or physical activity intervention Pregnant, <6 month postpartum, or planning to become pregnant in the next 3 months Presence of an uncontrolled mental health condition Extended absence (e.g., extended vacation) from the Providence area during the study Presence of a medical condition for which increased exercise may be contraindicated