> Experiments demonstrate that it is possible for arbitrary changes in the heart rhythm to be made through conscious control of the breathing rhythm, and even a short-term cardiac arrest by means of contracting abdominal muscles.
You can cherry pick stuff off the internet all you want. Doesn't make it good science or plausible.
Contracting your muscles to make your heart skip a beat or two does not count as "stopping your heart by thinking". By that logic I can drive my car by thinking.
I'll give you that you can influence the rate of your heart with practice.
> Experiments demonstrate that it is possible for arbitrary changes in the heart rhythm to be made through conscious control of the breathing rhythm, and even a short-term cardiac arrest by means of contracting abdominal muscles.
Again, best not to try it ;)