Adapting RDAD for DS

Inclusion Criteria - Adults with Down syndrome: * Age \>35 yrs. with a diagnosis of DS as self-reported or reported by caregiver. This age range was selected as cognitive decline related to AD is observed at age \~31 in adults with DS. * Sufficient functional ability to understand directions, communicate preferences, wants, and needs through spoken language. * Living at home or in a supported living environment with a parent/caregiver who agrees to serve as a study partner. * Self-reported ability to participate in physical activity. Exclusion Criteria - Adults with Down syndrome: * Unable to participate in moderate-to-vigorous physical activity. * Self-reported, cardiovascular, metabolic or renal disease and/or signs or symptoms. Inclusion Criteria - Caregivers * Age ≥18 yrs. * Reports being a primary caregiver of an adult with DS. * English speaking. * Self-reported ability to participate in physical activity. Exclusion Criteria - Caregivers * Unable to participate in moderate PA, i.e., brisk walking. * Self-reported, cardiovascular, metabolic or renal disease and/or signs or symptoms.