“So long as one keeps calm, one doesn't feel the heat too much.” Proverb said.
This proverb has been confirmed by Tibetan nuns: Tibetan nuns can change their core body temperatures with a certain form of meditation, which could keep them warm and help give their immune systems a boost.
A team of researchers recorded the internal temperature of nuns in the freezing cold of the Himalayas. The nuns, the researchers found, were able to increase their core body temperature with this technique--up to almost 101 degrees Fahrenheit.
Two techniques, specifically, caused the change. "Vase breath" is a breathing technique that causes heat production, and visualization--in this case, of flames near the spine--also accounted for the increase.Useful if you're out in the cold, but the technique, researchers say, could also be helpful in strengthening the immune system.