Mouth -to -mouth resuscitation has always been a priority component of CPR, but in the recent years the chest compressions took the highest priority. The steps for making chest compressions include the following:
How To Perform CPR Hands-Only
Locate the sternum compression point- the lower half of the sternum is the compression point in all age groups. It is consider that the lower half of the sternum equals as the center of the chest. Performing chest compressions too high will be 
ineffective and if you perform chest compression beyond the lower limit of the sternum you may cause damage to the internal organs. With this method you will minimize the pauses between the ventilations and compressions.
Kneel between the victim’s neck and shoulders– place the heel of your hands one atop the other in center of the victim’s chest and put your shoulders in the same area as your hands.
Use your upper’s body weight- start to push the chest down and try to compress the victim’s chest 1 to 2 inches (2.54 to 5.08cm). Push hard and try to complete at least 100 compressions per minute by keeping appropriate speed and pace.
Hands Only CPR For Babies
You use only two fingers and compress 1.5 inches (4cm) deep on the middle of the chest.
With compressing you are actually squeezing the heart between the breastbone and the backbone to force the blood out. With compressing the chest you are creating a positive pressure inside the chest that pushes the oxygenated blood out of the heart though the aorta. From this point it travels to the brain and the on to the other parts of the body.
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