I didn't mean running or any other physical activity (the example with cyclists was to show the physiological range which can be experienced by a human). Any person can dramatically change his heart rate through strong emotions and emotional recollections, and no physical activity.
So what are you actually disagreeing with? No one in good health can kill himself with just a thought.
of course this is possible, but the underlying reason to do so is not an active though - much more about the endocrine system and processing of emotions/memory of our brain. and even that has a limit which you cant go over or under.
but if you read the wiki link with the sources you will see things like:
1. increasing body temperature by 10+° degrees
2. decreasing heartbeat to ~10
3. decreasing metabolism by ~65%
I read your link, the relevant part is cited below:
Scientific investigation
A 1982 study of the physiological effects of Tummo has been made by Benson and colleagues, who studied Indo-Tibetan Yogis in the Himalayas and in India in the 1980s. Conducted in Upper Dharamsala in India, it found that the subjects, three monks, exhibited the capacity to increase the temperature of their fingers and toes by as much as 8.3 °C. In a 2002 experiment reported by the Harvard Gazette, conducted in Normandy, France, two monks from the Buddhist tradition wore sensors that recorded changes in heat production and metabolism. A 2013 study by Kozhevnikov and colleagues showed increases in core body temperature in both expert meditators from eastern Tibet and Western non-meditators.
As you can see, there is no mention of decreasing heartbeat to ~10 beats per second, which is beyond physiological range. Also, I tried to follow the links in the article, and I could find only
this:
Reliable increases in axillary temperature from normal to slight or moderate fever zone (up to 38.3°C) were observed among meditators only during the Forceful Breath type of g-tummo meditation accompanied by increases in alpha, beta, and gamma power.
...
There is currently no evidence, however, indicating that temperatures are elevated beyond the normal range during g-tummo meditation.
You can read for yourself. Just in case, if your core body temperature rises above 41 °C, the platelet membranes begin to disintegrate, blood clots and you die.