Inclusion Criteria:

• The patients fulfilled the criteria for COPD: the presence of a post bronchodilator FEV1 < 80% predicated together with an FEV1/FVC <0.70confirm the presence of airflow limitation that is not fully reversible.
• COPD patients ranging from mild to severe according to GOLD [stages I-IV].
• Asthmatic patients receive medical treatment for at least 6 months; and clinically stable (i.e., no exacerbation or changes in medication for ≥30 days).
• None of the individuals had been engaged in any exercise-training program before participating in the study.
• Optimized medical therapy according to GOLD & Global Initiative for Asthma (GINA)
• Clinically stable COPD and asthmatic patients (not suffering from a recent respiratory tract infection).
• All patients are Ex-smoker

Exclusion Criteria:

• Age <18 years.
• Pregnancy
• Current Smokers
• Patients that are incapable of exercising; unable to understand any questionnaire
• Multiple co- morbidity (e.g., cardiovascular diseases, active cancer)
• Neuromuscular disease as Myasthenia gravis, kypho-scoliosis
• Diaphragmatic Paralysis (paralyzed diaphragm exhibiting abnormal paradoxical movement, i.e., moving in a cranial direction during inspiration).