Two young women practicing yoga. The session has been imaged using thermography or thermal infrared which allows us to see thermal energy or radiation, more commonly referred to as heat. The different colors in the images represent different levels of thermal energy being emitted from the skin's surface. In this image the white, red, yellow and orange colors show a high level of thermal energy and the blue, black and purple a lower level. Pose: Intense stretch/Uttanasana B.