Participants
ideation, angina, stroke, psychosis, psychiatric, diabetes
MYOCARDIAL INFARCTION, STROKE, OSTEOARTHRITIS, CORONARY HEART DISEASE, DIABETES
Low active participants ages 18 years of age or older were recruited from the northern region of the United States through worksite emails. Eligibility criteria were assessed using a telephone-based interview. Exclusion criteria included the following: (1) Engaging in PA for more than 90 minutes each week; (2) lack of access to the Internet; (3) history of coronary heart disease (history of myocardial infarction, symptoms of angina); (4) orthopedic problems that would limit physical activity participation; (5) diabetes, stroke, osteoarthritis, and any other medical condition that may make physical activity unsafe or unwise; (6) current or planned pregnancy; (7) psychiatric hospitalization within the last six months; (8) psychosis or current suicidal ideation; and (9) unwilling to be randomized to either of the study conditions.