Everyone IMO should be trained in CPR properly. It should be as much part and parcel of Yeshivah education as math and science (and is probably a more practical skill to know than how to figure out tangents and quadrilateral equasions). And we should all take refresher courses. This applies to anyone who has a child or doesn’t, who is married or is not, who is old or young – EVERYBODY should know what to do in an emergency UNTIL hatzolah gets there. Sometimes you have literally SECONDS to save a life.
