Biofeedback is a real thing. You can learn to control (within limits) many aspect of your body: https://www.mayoclinic.org/tests-procedures/biofeedback/about/p

Biofeedback is a real thing. You can learn to control (within limits) many aspect of your body: https://www.mayoclinic.org/tests-procedures/biofeedback/about/pac-20384664 https://www.mayoclinic.org/tests-procedures/biofeedback/abou... I had a professor studying using it to mitigate Reynaud's disease, https://www.mayoclinic.org/diseases-conditions/raynauds-disease/symptoms-causes/syc-20363571 https://www.mayoclinic.org/diseases-conditions/raynauds-dise..., to gain some control of circulation in the fingers. But it's not like a movie, you aren't getting powers, but more shifting things to another point in their normal range.