So every now and again, normally on full exhale of breath, my hear will feel like it flips in my chest (not painful, just weird feeling) and if I feel the pulse in my neck while this happens, My pulse stops and/or lags for approximately a half of a second. For instance, say you felt a beat every 1/4 of a second, well, when this happens, you won t feel another for an addition half of a second. I don t know what this is, and over the last year or so it has become more frequent. And if it helps, I am pretty active every day. I m a Mechanic and constantly working full time