You can do only so much with a single signal. There's a reason ECG probes are attached to multiple points on the body, and you can infer quite a bit of info fr

You can do only so much with a single signal. There's a reason ECG probes are attached to multiple points on the body, and you can infer quite a bit of info from just comparing multiple signals alone, including if you have your heart flipped, for some reason. :D You'll not get that from your watch.