The document outlines a search strategy utilizing three databases to explore qualitative studies related to cardiac rehabilitation and its benefits on quality of life for adults published from 2010 to 2017. It also discusses physical inactivity as a risk factor for coronary heart disease, emphasizing the importance of exercise in recovery and the varying patient perspectives on its benefits. Additionally, it compares stratified random sampling and convenience sampling methods in research, detailing their implications on data representativeness.