The relationship between asthma and physical activity is very interesting and complex. The terms like exercise, asthma, airway dynamics, bronchospasm, bronchoconstriction, hyper-responsiveness, hyper-reactive, bronchial lability are being very frequently used in medical literature. These terms are very confusing sometimes due to their interchanging use. This review article was attempted to define and describe the phrases which contains these terms, with special attention towards their pathophysiology for better understanding. It was found that although sounds very similar, the terms like ?Exercise induced asthma?, ?Exercise induced bronchospasm?, ?Airway hyper-responsiveness? and ??Exercise induced bronchial lability? are very different in their pathophysiology, and should be used very appropriately.