Inclusion Criteria:  Age ≥ 18 Previously admitted to a hospital for Covid-19 Discharged from hospital for at least 30 days Previously treated for cancer at MSK Interval of ≥ 12 months but ≤ 10 years following completion of primary non-hormonal anti-cancer therapy (current endocrine therapy and maintenance therapy allowed) Space to house a treadmill at personal residence Cleared for exercise participation as per screening clearance via the Physical Activity Readiness Questionnaire (PAR-Q+) Performing less than 90 minutes of structured moderate-intensity or strenuous-intensity exercise per week, as evaluation by self-report  If a female of child-bearing potential, must not be pregnant or planning to become pregnant during the study.  Women <50 years old who are of child-bearing potential must have a negative pregnancy test within 14 days of enrollment.  Exclusion Criteria:  Currently receiving home oxygen after discharge Enrollment onto any other interventional investigational study Current treatment for any other diagnosis of invasive cancer of any kind Distant metastatic malignancy of any kind Receiving non-hormonal anticancer therapy Any other condition or intercurrent illness that, in the opinion of the investigator, makes the subject a poor candidate for study participation