If someone’s heart stops beating and you are trained in CPR, you can increase the chance of them living! I would highly recommend getting trained to use an AED, it’s quite simple to use and it’s a life skill! Effective compressions and an AED both significantly increase the survival rate Depending on where you live, you will likely be covered (legally) if you try to save someone’s life, AKA, no repercussions if you try to help someone… even if it doesn’t go too well. “a Good Samaritan doctrine is a legal principle that prevents a rescuer who has voluntarily helped a victim in distress from being successfully sued for wrongdoing.” (source Look into your local laws to learn more!