Cardiac arrest does not make appointments. It can happen on an ordinary Saturday morning run, at the end of a bike ride, or in the quiet of your own home – and in those moments, what the people nearby do in the first few minutes can be the difference between life and death. Cardiopulmonary resuscitation (CPR) is a simple set of actions that keeps blood and oxygen moving around the body when the heart suddenly stops, buying precious time until an ambulance and defibrillator ar