To carry out a chest compression:
-Place the heel of your hand on the breastbone at the centre of the person's chest. Place your other hand on top of your first hand and interlock your fingers.
-Position yourself with your shoulders above your hands.
-Using your body weight (not just your arms), press straight down by 5 to 6 cm (2 to 2.5 inches) on their chest.
-Keeping your hands on their chest, release the compression and allow the chest to return to its original position.
-Repeat these compressions at a rate of 100 to 120 times a minute until an ambulance arrives or you become exhausted.
CPR with rescue breaths
If you have been trained in CPR, including rescue breaths, and feel confident using your skills, you should give chest compressions with rescue breaths.
If you're not completely confident, attempt hands-only CPR instead.