To be clear, this would not be a certification, but you do not need to be certified to be a Good Samaritan (or possibly, as in the case of my father, save a loved one).
I will teach you CPR and/or AED usage.
CPR and AEDs save lives, and it never hurts to know how.
Training & Qualifications
I have been a lifeguard, EMT, Water Safety Instructor, Lifeguard Instructor, and First Aid Responder.