the spirit of the serpent
"Throughout the world, and down through the ages, the spirit of the serpent has been a symbol of healing, initiation, rebirth, transformation, and secret knowledge – knowledge that only the body knows. The snake sheds its skin and reappears in a brilliant and youthful form, being perpetually renewed. This strange ability was seen as symbolic of the higher mystery of both physical and spiritual birth and rebirth. The snake is also life energy, instinct, and the felt body experience – the facilitator of creative healing." (italics mine)
From Sacred Woman, Sacred Dance by Iris J. Stewart. One of the better explanations of the snake energy in my body and why its there.