Effective chest compressions:
A. Allow the chest to return to its normal position.
B. Are delivered fast at a rate of 100 to 120 compressions per minute.
C. Are smooth, regular, and given straight up and down.
D. All of the above

D. All of the above

Explanation:

Are smooth, regular and give straight up and down; allow the chest to return to its normal position; are delivered fast, about 100 compressions per minute

it hurts at first because " the cherry is broken" which is a thin layer of skin that breaks so the first time girls have sex it hurts and it bleeds but after the first time it does hurt again because the skin that ia torn does not break again/ grow back.

football or basketball players.