"That CPR is Clean, Pretty, and Reliable. If you’re doing chest compressions correctly, you’re breaking ribs with them. The person whose heart isn’t beating is probably going to vomit if they wake up, and it’s a coin flip at best if they’re actually going to be helped by it. It’s something that will do some amount of harm to potentially save your life, which is what you’re at when you’re in a situation where CPR is actually necessary."