Step 1: FAQ
CPR is an abbreviation for Cardio-Pulmonary-Resuscitation. It is manually pumping a persons heart and breathing for them.
Is it dangerous?
It is recommended that unless the situation is dire you should not make mouth to mouth contact without a barrier. If you carry a wallet or purse you could easily fit a disposable mask in case of emergency.
Is it tiring?
CPR is an extreme workout. It takes tons of energy and physical strength.
When should I stop giving CPR?
There is only two reasons you should stop giving CPR. If the persons regains a heartbeat and can breath or if you feel so tired that if you continue you'll pass out as well. Other than that you should give CPR until further help arrives.
Step 2: Disclaimer
Step 3: Step 1
Step 4: Step2
Now check for a response. If the victim doesn't respond proceed to step 3 of CPR.