Inclusion Criteria:  are African American (self-identify) are 65 - 85 years of age are physically capable of exercise are willing to accept randomization are willing to attend group sessions plan to live in the study area over the next 13 months and capable of traveling to designated study facility for clinic visits and intervention sessions for the next year are free of conditions (e.g. uncontrolled asthma, severe sickle cell disease, etc.) that would make regular exercise unsafe as deemed by the medical investigator have not engaged in regular physical activity have a Short Physical Performance Battery ≥4 physically capable of exercise are unable to utilize devices and/or applications as required for study participation willing to attend group sessions are willing to have a study partner willing to allow researchers to use data for research purposes after study participation is completed meet criteria for MCI as defined by the NIA-AA research framework a. cognitive performance below normal range (score < 1.5 SDs below the mean on NIH Toolbox scores for their age and sex on at least one of the subtests)  Exclusion Criteria:  have cognitive impairment that would interfere with participating in a group discussion  a. cognitive performance in the demented range (score < 3 SDs below the mean on NIH Toolbox scores for their age and sex on at least one of the subtests)  meet criteria for dementia are unwilling to give written informed consent or accept randomization in either study group  are too active (as defined by ≥10 min bouts of MVPA as measured by Actigraph) if:  Sum of MVPA bouts for the 7 day wear period ≥40 mins Or ≤40 mins of MVPA 10min bouts AND ≥3 days of bouts have uncontrolled hypertension (systolic blood pressure > 150 mmHg and/or diastolic blood pressure > 90 mmHg). have had a myocardial infarction, major heart surgery (i.e., valve replacement or bypass surgery), stroke, deep vein thrombosis, pulmonary embolus, hip fracture, hip or knee replacement, or spinal surgery in the past 6 months are undergoing cardiopulmonary rehabilitation have uncontrolled diabetes that in the judgment of the MI may interfere with study participation have clinically diagnosed osteoporosis that in the judgment of the MI may interfere with study participation are currently enrolled in another randomized trial involving lifestyle or pharmaceutical interventions have another member of the household that is a participant in RAATE or RAATE MCI do not have a supportive partner for participation. have a contraindication to MRI have a contraindication to PET: Estimated radiation exposure over the past 12 months greater than 5000 mRem, per PBRC Radiation Safety Committee screening form refuse to participate in the study without disclosure of their amyloid PET scan results refuse to allow anonymized versions of their study data for research after this study is completed. have other medical, psychiatric, or behavioral factors that in the judgment of the Principal or Medical Investigator may interfere with study participation or the ability to follow the intervention protocol