Effects of Post-isometric Relaxation Technique on Chest Expansion and Pulmonary Function Tests in Smokers

"Post isometric relaxation technique: It is defined as a manual procedure which involves the precisely controlled and specifically directed active contraction of a muscle at varying levels of intensity against a counterforce applied by the therapist.~PIR will be applied to following muscles~1. scalene (anterior, middle and posterior)~2. sternocleidomastoid"