I have PVC and PACS with an occasional side order of SVTs. I'm able to catch the runs of SVTs on my apple watch which look very scary to me, but my cardiologist told me not to worry; as long as my heartbeat returns to normal within a short amount of time. They are however, very bothersome as it feels like something is wrong. I've been exercising on an elliptical daily, fairly intensive for 30 minutes, and not letting my heart rate go above 130. Don't want anything to happen at the gym. My cardiologist said there's no need to run any more tests or see an electrophysiologist. So we shall see.