A Personalized Behavioral Intervention to Improve Physical Activity, Sleep and Cognition in Sedentary Older Adults

In-person training with the exercise trainer ( 3 sessions for participants without cognitive impairments over 24 weeks \& 4 sessions for older adults with mild cognitive impairment over 16 weeks). Self-monitoring level of physical activity (steps \& minutes of moderate activity) using the smart watch. . The Google calendar and Fitbit apps will send messages and alerts to the subject's smart watch that encourage subjects to achieve subjects' daily goals. If a participant has low activity for 3 consecutive days, the research assistant will call the participant to either encourage the participant to adhere to the plan or provide a modified plan after consulting the exercise trainer. Phone consultation: Subjects will have biweekly phone consultation with the research team members to receive guidance and adjustment on activity plans.Financial incentives: when the daily activity goal is achieved for more than four days per week, a $5 reward will be given to subjects.

General Education on physical activity for older adults and continue daily activity and healthcare routine. Participants will also receive a Go4Life Program book from the National Institute on Aging