- Age = 18 years- Admitted to one of our COVID-19 cohort units- PCR confirmed COVID-19- Any form of oxygen therapy (nasal cannula or high-flow nasal oxygen)- Able to independently change from supine to non-supine position- Able to read and speak in the Dutch language- Signed informed-consent- No current indication for mechanical ventilation

- Age = 18 years- Admitted to one of our COVID-19 cohort units- PCR confirmed COVID-19- Any form of oxygen therapy (nasal cannula or high-flow nasal oxygen)- Able to independently change from supine to non-supine position- Able to read and speak in the Dutch language- Signed informed-consent- No current indication for mechanical ventilation