Can pool workouts plus brain games sharpen memory in aging veterans?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Veterans of any racial or ethnic group * Diagnosis of single or multi-domain amnestic MCI using criteria per National Institute on Aging/Alzheimer's Association Guidelines * Available informant for completion of the Clinical Dementia Rating Scale * Visual and auditory acuity to allow neuropsychological testing * Willingness to participate in clinical trial for 14 months (8-month treatment phase, 6-month no-contact follow-up phase) * Musculoskeletal illness or injury (i.e., osteoporosis, degenerative disc or joint disease, arthritis, obesity) * Approval by Primary Care Provider to participate in water-based physical exercise Exclusion Criteria: Psychiatric Exclusions * Current, uncontrolled severe psychiatric disorder, such as Bipolar I, Schizophrenia, or Major Depressive Disorder as determined by the Mini International Neuropsychiatric Interview (MINI) * Diagnosis of dementia, Clinical Dementia Rating Scale (CDR) \> 0.5; modified Hachinksi score 4; or delirium. Those Veterans with scores indicative of dementia (CDR \> 0.5, modified Hachinksi 4) will be referred to the Memory Disorders Clinic at VAPAHCS for a full diagnostic work-up Medical Exclusions * History of neurological (e.g., multiple sclerosis, seizure disorder, stroke,) or system illness affecting CNS function (e.g., liver failure, kidney failure, congestive heart failure, systemic cancer) * Acute illness or unstable chronic illness, e.g., history of severe liver disease (cirrhosis, esophageal varices, ascites, portal hypertension, hepatic encephalopathy) * Current severe cardiac disease (e.g., uncontrolled atrial fibrillation, defined as mean 24 hour heart rate \>85 beats/min, or 24 hour maximal ventricular rate \>150 beats/min; uncontrolled ventricular arrhythmias, defined as recurrent ventricular tachycardia \>3 beats in succession, or 24 hour PVC count \>20%; active pericarditis or myocarditis; Class III/IV heart failure and / or ejection fraction \< 20%; thrombophlebitis; pulmonary disease with a drop in O2 Sat with exercise to 90% without oxygen; embolism within past 6 months) * Inability to participate in an exercise stress test * Inability to read, verbalize understanding and voluntarily sign the Informed Consent