Yin, a more abstract, slow and deep energy, is the balancing force to yang, the more surface, fast and defined side aspect. The practice is designed, on a physical level, to open the connective tissue of the body and increase flexibility. On an energetic level it serves to clear blockages from energy channels known as meridians or nadis so that energy can flow unobstructed and overall health and balance is restored or maintained. On a mental level it allows the opportunity to observe the mind in a meditative sense since the body is held in stillness for long periods of time so there is minimal external distractions, providing the chance to look at the habits and the inner workings of the mind. The emotions of the body that have not have been stored, suppressed, held in the physical tissues of the body are set free, allowed to move, to flow, to be felt, and to be released.