Qi (traditionally known as chi or ch’i) is a Chinese word for the vital energy or life force within all things. Broken down into the Yin (negative/feminine) and Yang (positive/masculine), the force is taken in through breathing and can be harnessed and strengthened by focusing on the breath. Scientifically, Qi has not been proven to exist however, Chinese medicine, such as acupuncture and Feng Shui (arrangement of space based on the 5 elements) use the theory of Qi in order to benefit health. Studies on either have been problematic and difficult to compare, leaving room for skepticism.