One way is the physical way: the practice of standing in the same position, of sitting in the same posture for a certain time. When one begins to do it one will find that it is not so easy as it appears to be. A person may sit in a same posture or stand in a same position without knowing it, but as soon as he begins to practice it, he finds great difficulty in doing so. When this is achieved then there are different positions of holding hands or legs or eyes or head; these practices develop the power of self-discipline.