Inclusion Criteria:  Virology plymerase chain reaction (PCR) positive laboratory diagnosis of COVID-19, Within 6 months of diagnosis, Persistent symptoms for at least 4 weeks from symptoms onset (Groups A & B only) Presentation type - one of group A, B or C;  Exclusion Criteria:  Physiotherapy as part of standard care e.g. post intensive care unit (ICU), post high dependency unit (HDU), No expectation of being able to walk within 3 months Unable to provide informed consent, Unable to comply with the protocol. Known pregnancy