Effect of Diaphragmatic Strengthening Exercises on Diaphragm Muscle Function in Patients With Post Covid-19 Syndrome.

Inclusion Criteria: * Male and female above 18 years old * history of probable or confirmed SARS-CoV-2 infection 3 months from the onset of symptoms or at least 2 months from the end of symptoms . Exclusion Criteria: * Subjects under 18. * Patients known to have chronic lung disease . * Patients known to have neuromuscular disorder. * Patients known to have diaphragmatic hernia. * Patients known to have malignancy. * Patients with clinical evidence of phrenic nerve injury. * Patients with recent abdominal or thoracic surgery, * Patients with history of traumatic lesion possibly affecting diaphragm. * Subjects with severe malnutrition. * Patients with BMI more than 30