Water-based Activity to Enhance Recovery in Long COVID-19

Inclusion Criteria: * Veterans, age 18 to 89, of any racial or ethnic group * Previous COVID-19 infection at least 6 months after diagnosis documented in clinical record * Persistent neurological symptoms (e.g., "brain fog", cognitive impairment) occurring within 3 months of onset of COVID-19 infection and lasting at least 8 weeks in duration * Visual and auditory acuity to allow neuropsychological testing * Willingness to participate in clinical trial for 8 months * Approval by Primary Care Provider to participate in water-based physical exercise Exclusion Criteria: Psychiatric Exclusions * Current, uncontrolled severe psychotic disorder determined by the Mini International Neuropsychiatric Interview (MINI) Medical Exclusions * History of neurological (e.g., multiple sclerosis, seizure disorder, stroke,) neurodegenerative (e.g., Parkinson's disease, Alzheimer's disease) or system illness affecting CNS function (e.g., liver failure, kidney failure, congestive heart failure, systemic cancer) occurring before COVID-19 diagnosis * 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