Sixty patients with Chronic Obstructive Pulmonary Disease (COPD) will be randomly assigned to the experimental (EX) group and the control group (CON). The participants' age will be 55 years and above with history of COPD. The Ex group will attend 4 sessions/week of Manual Diaphragm Release Technique Combined with Deep Breathing (10:15-min) for 8 weeks, the CON will attend 4 sessions/week of Deep Breathing (10:15-min) for 8 weeks. The stepping reaction time will be assessed by the choice stepping reaction time (CSRT). The Balance will be determined using a Time up and Go test (TUG) an d Berg balance scale (BBS). All the outcomes will be examined at baseline, and 8 weeks of the intervention.
