No, you do not have to be certified in CPR to try and help someone. It is good to be trained to ensure you are performing chest compressions and rescue breathing properly and not causing more harm. By performing CPR on a person with a heartbeat, you could cause more harm.
Becoming certified in CPR you will know when to perform chest compression. You will also learn how to perform chest compressions correctly and adequately. You will be taught when to perform only rescue breathing. Although you do not have to be certified to administer CPR it is a good idea to be properly trained.
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