behavioral health fitbit sedentary behavior Mobile Apps smartphone
Inclusion criteria will be: 1. Inactive (engaging in less than 1000 metabolic equivalent of task (MET)-minutes/week reported on the International Physical Activity Questionnaire); 2. Aged 40 -65 years 3. Own an Android smartphone that can connect to a Fitbit Zip via Bluetooth 4.0 4. Willing to engage with the mHealth intervention for 12 weeks. Exclusion Criteria: 1. Not proficient in English, pregnant 2. If they indicate medical problems that preclude physical active based on the Physical Activity Readiness Questionnaire (PAR-Q), 3. Have a BMI above 45 4. Currently participating in a commercial or research-related diet or exercise program

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