Inside History on Instagram: "CPR, or Cardiopulmonary Resuscitation, is a life-saving emergency technique used when a person’s heart stops beating. To perform CPR, place the heel of one hand in the center of the chest, place your other hand on top, and press down hard and fast—aiming for a rate of 100 to 120 compressions per minute. If you’re trained, give two rescue breaths after every 30 compressions. CPR keeps blood and oxygen moving through the body until emergency responders arrive, and it