It s okay to move a bit, or shrug your shoulders or bend forward to relieve the discomfort, and then you should resume the correct posture. It is also possible for some sensitive people to feel pain or discomfort, which may be caused by blocked Qi trying to get through the pathways known as meridians. This is part of the healing process. If it gets too uncomfortable, you may want to move your body slightly. The discomfort will go away during the closing procedure, provided closing is done properly.
Some people have difficulty concentrating, distracting ideas seem to keep entering the mind.
At such times, one should concentrate on breathing and on the contents of Step One. Do not commence practice if you are emotionally upset, or if you just ate a full meal. Wait half an hour. Wear loose comfortable clothing, find a quiet time and location, and practise with a calm mind. Steps Two to Nine are usually only practised when one has mastered Step One.