tummo

on the icy slopes of the himalayas adepts of a yogic technique known as tummo are said to be abe to generate so much body heat that they require little or no clothing. through various vizualisations and breathing exercises, the adept imagines a tiny blaze of fire at the base of the spine, which he causes to extend to the limits of the body and expand to fill the entire universe. to test the success of the adept at tummo, the guru may require him to sit naked on a mountainside throughout a winter night. during this time the adept must dry sheets dipped in icy water one after another by wrapping them around himself and subjecting the sheets to the blaze of psychic heat.