inclusion criteria: - discharged patients with covid-19 pneumonia, - having at least one rt-pcr covid test, - duration of hospitalization > 10 days, - ability to walk, - totally oriented, - ability to use smartphone, - ability to read and write in persian.

inclusion criteria: - discharged patients with covid-19 pneumonia, - having at least one rt-pcr covid test, - duration of hospitalization > 10 days, - ability to walk, - totally oriented, - ability to use smartphone, - ability to read and write in persian.