Only those that are discharged from the UIHC COVID-19 inpatient clinic and/or that meet the CDC guidelines for discontinuing home isolation (i.e., fever free for at least 24 hours, all symptoms improved after 10 days) will initially be considered as long as they meet the rest of the following criteria:  Inclusion criteria  18-80 yrs. Meet CDC guidelines (https://www.cdc.gov/coronavirus/2019-ncov/hcp/duration-isolation.html) for discontinuation of home isolation Meet the criteria for fatigue, based on the Chalder Fatigue Scale CFQ-11 case definition of fatigue Healthy enough to complete the protocol based, on information obtained from a clinical exam and past medical history, such as cardiovascular disease. Comprehension of the protocol, as indicated by an ability to respond to questions about the study after reading the consent form. Able to use and be contacted by telephone Able to speak, read, and understand English, and complete questionnaires in English  Exclusion criteria  Medical diagnosis or condition that is considered to be an absolute or relative contraindication to participating in exercise training, such as major renal, pulmonary, hepatic, cardiac, gastrointestinal, HIV, cancer (other than treated basal cell cancer), or neurological disorders History/presence of secondary conditions such as seizure disorders (or on medications known to lower seizure threshold), hydrocephalus, diabetes mellitus, or claustrophobia Alcohol dependence or abuse (>2 drinks/day), or present history of drug abuse (last six months) History of significant traumatic brain injury or hydrocephalus Pregnancy