Daily Goal Setting to Increase Everyday Physical Activity and Promote Cognitive Health in Midlife

The purpose of this study is to determine whether interaction with an adaptive Fitbit-based goal setting application can increase levels of everyday light intensity physical activity in middle-aged adults.

Inclusion Criteria\*: * Between 30 and 70 years of age * BMI ≥ 25 Exclusion Criteria\*: * Clinical diagnosis of ADRD or other neurodegenerative disease * Health condition contraindicated for increased physical activity * Medical conditions or medications that would prohibit participation in an exercise test (e.g., decompensated heart failure, severe aortic stenosis, uncontrolled arrhythmia, and acute coronary syndromes) * Limitations in use of a smart phone (e.g., issues with manual dexterity or visual impairment) * Inability to walk unassisted * BMI \> 50 * Plan to have surgery or other procedure over the next 12 months that could affect mobility or light intensity physical activity maintenance * Concurrent participation in a weight loss, physical activity, or cognitive training trial * Failure to comply with Run-in Period activity monitoring (\