Exercise therapy as beneficial component of cardiac rehabilitation for heart patients e.g past CABG is increasingly accepted with variety of protocols and guidelines under phase 2 by professional organizations in most of the developed countries but its applicability in Pakistani heath care system/hospitals is far less known and practiced. this highlights need to study post CABG patients to document the effectiveness cardiac rehabilitation exercise (CRET) of low intensity, high frequency and short duration with respect to functional improvements in cardiac and muscle.