In Yoga poses like Supta Virasana, Sarvangasana (Shoulder Stand) and Halasana the arms can go numb because the circulation is restricted. Imagine a dam; when the gates of the dam are closed the flow of water is cut off from its direct path and is distributed in different directions. The same is true in poses such as these. The blood flow to your arms is constricted and the blood is diverted to other parts of the body. When the arms come back down they are flushed with fresh blood. This is a process that happens in many of the Asanas; blood flow is constricted in an area so that it can be flushed with fresh blood upon release. How we interact with the sensations that come with these processes though, can dramatically transform our experience. It seems obvious that if we say ‘my arms are numb, it feels horrible’ then our experience of the Yoga pose will be certainly be horrible. How then do we distinguish between?