Teranchi says the combination of volcanic ash and Calistoga’s natural geyser water can improve circulation, restore sore muscles, and even treat skin reactions like eczema. Was this what was happening to me? This combination of mud, heavy and overwhelming, that slightly restricted my ability to breathe, and the peaceful silence surrounding me immediately set me into a meditative state. I felt cramped, but complete; the warm mud wrapped around every inch of my body was debilitating, yet purifying.