Performing CPR in a timely fashion can save a life:
"Only 10 percent of people who suffer out-of-hospital cardiac arrests survive, and the majority don’t get the immediate help they need from bystanders. High-quality CPR can double or triple a victim’s chance of survival."
This lesson was brought home by an amazing story in which "[a] doctor who presented research on the importance of CPR during the American Heart Association’s resuscitation conference in Chicago proved her point hours later, saving a man who collapsed in a hotel lobby." [link]
Apparently the compressions were able to restart the man's heart, which is a bit unusual. Typically the heart does not start beating again, and the compressions are necessary to circulate the blood until the patient can receive more advanced medical treatment.
In a previous post, I have described how to perform CPR including a "hands-only CPR" variant that does not involve mouth-to-mouth, which can be exhausting but is not as critical as the chest compressions.
If you are untrained in CPR, there are many available courses. To keep your skills up, you should repeat the training every two years. Learning CPR could save a life.
Figure 1. Dr. Monique Anderson saved a life by CPR moments after concluding a lecture on how CPR can save lives.

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