Defy The Odds: Exercise Forecasting and Motivation Strategies for Prolonged-Sitting Jobs

Inclusion Criteria: * Can communicate in English * Currently participate in less than 30 minutes of regular physical activity per week. * Healthy male/female, age \>=40 * Currently working in a prolonged sitting job (e.g., truck driver or office worker). * Have been working in this industry/business for at least one year. Exclusion Criteria: * Have had a heart attack within the past three months * Surgery in the past three months * Recent stroke, mini-stroke/TIA in the past three months * Recent seizure disorder or epilepsy in the past three months * Had an aortic aneurysm before * Have a medical condition or physical limitation that makes physical activity unsafe * Currently meeting or exceeding physical activity guidelines (≥150 minutes/week of moderate-intensity activity or equivalent). * Cannot wear a smartwatch for 30 days. * Do not want to install a study APP in smart phone for 30 days. * Cannot respond to the study APP notification for 30 days.