Doing CPR right away can double or even triple a person’s chance of surviving cardiac arrest. Learn these CPR steps now so you know what to do if someone is experiencing a life-threatening emergency.

When a person has a cardiac arrest, the heart quivers with uncoordinated contractions and is unable to pump blood; the person will lose consciousness and their heartbeat will stop.

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These CPR steps (chest compressions and rescue breaths) will help circulation and get oxygen into the body until an emergency responder can shock the heart back into a normal rhythm. Early use of an AED (automated external defibrillator), if one is available, can restart a heart with an abnormal rhythm. (AEDs are often found in malls, sports arenas, gyms, and other public places for just this purpose, and can be used by anyone who follows the instructions.)

See someone who looks like they might need CPR? You first need to make sure it’s safe to approach. If it is, tap the person’s shoulder and ask if they’re okay. If they don’t respond, open their airway to check if they are breathing (don’t begin CPR if a patient is breathing normally). Then, get help. If you’re not alone, ask someone to call 911 for help as soon as you have checked breathing, and have the person confirm the call has been made. While help is on the way, follow these CPR steps:

1. Position your hand

Make sure the patient is lying on his back on a firm surface. Kneel beside him and place the heel of your hand on the center of the chest.

2. Interlock fingers

Keeping your arms straight, cover the first hand with the heel of your other hand and interlock the fingers of both hands together. Keep your fingers raised so they do not touch the patient’s chest or rib cage.

3. Give chest compressions

Lean forward so that your shoulders are directly over the patient’s chest and press down on the chest about two inches. Release the pressure, but not your hands, and let the chest come back up.

Repeat to give 30 compressions at a rate of 100 compressions per minute. Not sure what that really means? Push to beat of the Bee Gees song “Stayin’ Alive” or Beyoncé’s “Crazy In Love.” To make sure you’re prepared, check out these surprising items you can’t leave out of your first aid kit.

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Note: The American Heart Association recommends Hands-Only CPR (CPR without rescue breaths, which are detailed below) for people suffering out-of-hospital cardiac arrest. According to the AHA, only about 39 percent of people who experience an out-of-hospital cardiac arrest get immediate help before professional help arrives; doing Hands-Only CPR may be more comfortable than doing rescue breaths for some bystanders and make it more likely that they take action. The AHA still recommends CPR with compressions and breaths for infants and children and victims of drowning, drug overdose, or people who collapse due to breathing problems. Don’t miss these other medical tips doctors and nurses want you to know.

4. Open the airway

Move to the patient’s head. Tilt his head and lift his chin to open the airway again. Let his mouth fall open slightly.

5. Give rescue breaths

Pinch the nostrils closed with the hand that was on the forehead and support the patient’s chin with your other hand. Take a normal breath, put your mouth over the patient’s, and blow until you can see his chest rise.

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6. Watch chest fall

Remove your mouth from the patient’s and look along the chest, watching the chest fall. Repeat steps five and six once. Make sure your child memorizes these CPR steps, plus these other first-aid tips parents should teach their kids.

7. Repeat chest compressions and rescue breaths

Place your hands on the chest again and repeat the cycle of 30 chest compressions, followed by two rescue breaths. Continue the cycle. Aside from these handy CPR steps, here are more medical procedures you can do at home.

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This article first appeared on TheHealthy.com.