I was just getting less and less fit the more and more I tried ♪ completing quite a difficult triathlon I noticed my heart rate about 219 beats per minute which is ridiculous, but I realized I've got an ECG on my watch and it came up saying Atrial Fibrillation went to the doctors it was this underlying health condition which I didn't know I had I had open heart surgery Almost like I've got a new engine in I can't say enough good things about the Apple Watch, it’s amazing. ...