Final answer:
Stop chest compressions and check for signs of life if the victim's chest begins to rise and fall during CPR. If there are signs of life, monitor the victim; if not, continue CPR. Proper hand position is between T4 and T9 on the sternum.
Step-by-step explanation:
If while performing CPR you notice that the victim's chest begins to rise and fall, you should immediately check for breathing and signs of circulation such as movement, coughing, or breathing naturally. If the person shows signs of life, stop chest compressions and monitor their condition until emergency services arrive. If they do not, it is imperative to continue performing CPR. It's important to note that proper technique is crucial for the effectiveness of CPR and to minimize injury. The proper position for hands on the sternum during CPR is between the lines at T4 and T9 to safely compress the heart and avoid damaging internal organs.