A healthy heart is fundamental to overall health and wellbeing. Your heart sits in your chest, behind the left-lower part of your rib-cage. It is made of specialised muscle and works as a two-sided pump with valves to circulate blood through your cardiovascular system (arteries, capillaries and veins). The right side of your heart delivers blood to the lungs where oxygen is collected, and the left side of your heart delivers the oxygenated blood to your body’s organs (including the heart itself, via the coronary arteries).