It is advisable to lie on a yoga block with your neck and your back in order to relieve the neck muscles a little and to make the stretching of the back easier. There are three important movements in the Plough: 1) The upper back is stretched up to the top of the chest bone. This means that the upper back does not sink down and there is no bend in the back. 2) Through the upward movement from the upper back you get a movement in the direction of the chest bone 3) You stretch your pelvis upward from the sacrum, with the result that your chest bone gets more space. During this exercise you should try not to lose these three connections. In fact try to work them out further and further.