At first the ribcage may seem stuck, on some people it will not move at all. Try not to lift the chest up but rather let the ribs swing out to the sides. Repeat this motion 10 times. If you perform this exercise correctly you should feel a slight to considerable release in the ribcage less tension. If you feel no movement in the ribs,you will need to apply more pressure on the ribs and suck the air in like you are blowing up a balloon inside your stomach and ribs by sucking air in.
Most people lift the chest upwards to inhale deeply.
This a result of a habit in the body whose origin is most likely from years of accumulated tensions. When you lift the chest to breathe your body is trying make room for the breath since the abdomen and ribs are usually held in and there is nowhere for the breath to go but up. The chest needs to be in a slightly lifted position in order to breath correctly. Good alignment comes from lengthening the spine in both directions to bring the chest into a slightly lifted position most naturally. See the next section on the sternum to experience this effectively.