Multi-domain Online Therapeutic Investigation Of Neurocognition (MOTION)

Inclusion Criteria: * age ≥ 55 years * subjective cognitive complaints, defined as self-experienced persistent decline in cognitive capacity in comparison with a previously normal status and unrelated to an acute event * Montreal Cognitive Assessment (MoCA) score suggestive of Mild Cognitive Impairment (MCI) status (i.e., \< 26) * English language fluency * Wireless internet connection at home * Willingness to travel to the San Francisco VA in northern California or UCLA in southern California for in-person assessments at baseline, after the 12-week interventions, and at the 36-week follow-up * Capacity to provide informed consent or legally authorized representative consent and participant assent. Exclusion Criteria: * current or past Axis I psychiatric disorders, or recent unstable medical or neurological disorders * disabilities that prevent participation in on-line movement classes (e.g., primarily use wheel-chair, severe visual impairment that would limit ability to observe instructor's movement on screen or severe hearing impairment that would limit ability to hear instructor's directions) * insufficient English proficiency * limited life expectancy (i.e., enrolled in hospice, metastatic cancer) * plan to travel for \> 1 week during 12-week intervention period * diagnosis of dementia per the DSM-5 * MoCA score suggestive of dementia (i.e., \<17) * started dementia medication (cholinesterase inhibitor or memantine) in past 3 months or plans to start dementia medicatio…