if you want to develop the power of concentration, then here is an exercise you can try. first wash your face and eyes properly with cold water. then make a black dot on the wall at eye level. stand facing the dot, about ten inches away, and concentrate on it. after a few minutes, try to feel that when you are breathing in, your breath is actually coming from the dot, and that the dot is also breathing in, getting its breath from you. try to feel that there are two persons: you and the black dot. your breath is coming from the dot and its breath is coming from 