What is "after gary gives 30 chest compressions?

After Gary gives 30 chest compressions, he should then move on to giving 2 rescue breaths. This cycle of 30 compressions followed by 2 breaths is known as CPR (cardiopulmonary resuscitation) and is used to help someone who is in cardiac arrest.

It is important to continue this cycle until professional help arrives or the person starts breathing on their own. The purpose of the chest compressions is to keep blood flowing through the body and to the brain, while the rescue breaths provide oxygen to the lungs.

It is recommended to perform CPR on a hard, flat surface and to press down on the chest at a rate of about 100-120 compressions per minute. Proper training in CPR techniques is crucial in order to effectively administer this life-saving procedure.