CPR

[cannongal]

Do any of you know how to perform it?

I don't know if this is always said to those beginning to learn, but this is what I was told--"bones can be broken, when that happens you will hear and feel it".

I used to be certified in both infant/child  and adult cpr.  Cracked bones are common.   The goal is to squish the heart very,  very briefly,  let it bounce back and repeat.   You have to push somewhat hard on the ribcage to do that, and adrenaline can sometimes make you push harder than you realize.   It's easy to crack a rib that way.