The 30-Second Test That Could Save Your Heart Cardiac problems sometimes progress quietly, but a simple test may reveal warning signs before trouble starts. In simple terms, it’s a quick way to see how your heart rate reacts to mild effort. This 30-Second Heart Test isn’t a diagnosis, though it https://share.evernote.com/note/4768a240-fc70-380c-4d35-0ea36c97e5b0