Look into practices of Tibetan monks and Indian Yogis. They specifically train their bodies to do extraordinary things.
One example is that they will meditate outside in near- or sub-freezing temperatures and have cold wet sheets placed on their skin, which they will heat and dry by controlling their metabolism (no shivering involved)[1]. I'd not be surprised to find that these studies and practices were an inspiration for Herbert's idea in Dune.
Look into practices of Tibetan monks and Indian Yogis. They specifically train their bodies to do extraordinary things.
One example is that they will meditate outside in near- or sub-freezing temperatures and have cold wet sheets placed on their skin, which they will heat and dry by controlling their metabolism (no shivering involved)[1]. I'd not be surprised to find that these studies and practices were an inspiration for Herbert's idea in Dune.
[1] https://news.harvard.edu/gazette/story/2002/04/meditation-ch...