Inclusion Criteria:  Individuals who had been diagnosed with COVID-19 positive and whose last polymerase chain reaction(PCR) test was negative with the following criteria:  aged between 20 to 80 years old persistent symptoms after recovery from COVID-19 infection, including any of the following symptoms: dyspnea, persistent cough, easily fatigue, headache or joint pain able to speak and understand Mandarin no cognitive impairment (Mini-Mental State Examination > 24) able to walk including those who need the walking aid had mobile phones and could easily access the Internet  Exclusion Criteria:  a history of chronic obstructive pulmonary disease or other respiratory diseases a history of arrhythmia,cancer, end-stage renal disease with dialysis, being diagnosed with mental illness, recent stroke within 6 months inability to participate because of comorbid neurological or musculoskeletal conditions that produce moderate to severe physical disability need all day oxygen support