Inclusion Criteria:  Diagnosis of COVID19; Respiratory failure in Sars-Cov2 pneumonia; ARDS in Sars-Cov2 pneumonia; Interstitial pneumonia from Sars-Cov2; Rankin scale ≥ 3/5 before enrollment (therefore at discharge); Patients in need of rehabilitation; Patients discharged from the hospital at their home; Patients with internet access; Owners and users of smartphones / tablets / PCs; Owners a pedal / stationary bike and oximeter.  Exclusion Criteria:  Asymptomatic or paucisymptomatic patient; Institutionalized person; Unstable angina; Recent IMA; Life expectancy <12 months for other comorbidities (eg advanced cancer).