Study aim: Investigating the effect of pranayama on the respiratory function of recovered patients from covid-19 Design: Before starting the interventions, all independent and dependent variables related to individual characteristics and the main and secondary outputs of the present study will be measured. Then, the participants of the intervention group will perform paranayama exercises on a regular basis, during 12 sessions. All spirometry measurements in this study will be performed according to standard recommendations. each patient will perform breathing exercises using a standard spirometry to measure forced expiratory flow in the first second , vital capacity , FEV1/FVC ratio should be evaluated. Settings and conduct: Pranayama breathing is performed 10 rounds of 10 s during 6 weeks and 3 times a week {at homes} and the parameters are checked with spirometry and 6-minute walk methods at Vali E asr Fasa Hospital. Participants/Inclusion and exclusion criteria: A definite diagnosis of covid-19 and discharge from the hospital over 18 has not suffered from any other acute illness except for covid-19 in the past 6 months. The patient does not have Chronic obstructive pulmonary disease or other respiratory diseases The participant's forced expiratory volume in 1s must be above 70% discharged from the hospital for a week. Intervention groups: participants will be selected from among the discharged patients of Covid-19 from Valiasr Hospital.Then, the process of conducting the intervention and reviewing the results will be explained to the qualified people and the participants will enter the study while completing the written informed consent. To measure the desired goals in this study, we need to divide the participants into two control and intervention groups. The subjects will be randomly divided into seven blocks of ten in two groups . Main outcome variables: Respiratory function