At The Beijing College of Traditional Chinese Medicine & Institute of Qigong Science, EEG results on Qigong practioners showed a predominance of alpha brain waves indicating that Qigong induces a relaxed and focused mind. After just three or four minutes there was a measurable shift of alpha and theta concentration from the rear occipital regions to the frontal lobes. This corresponds to a union of the mind and body from which feelings of peace and harmony arise.
If you can, it's good to do some of your Qigong training outside. If you live in the city then get up early and go to the park, preferably a place where there are some trees.
Just as we spring clean our house we can also spring clean our body, being outside helps us to clear our stagnant energy and breathe in fresh air. It also reinvigorates our practice. The important thing is to be awake to the practice. It is important not to do Qigong by rote but say to yourself: For these next twenty minutes I'm going to dedicate myself completely to this practice, I'm going to let go of my worries and my thoughts and just do it.
A practice free from doubt and worry is what we mean by heart mind practice. If the mind and heart are dispersed then our Qi will be, and there won't be as much power in the practice. Because we are so used to thinking all the time, at first this may be difficult but the more we practice, the more we will find that our mind and body remembers, and concentration and letting go will come easily. Ironically it is when we are feeling most stressed and tired that we resist the practice, and this is when we need to do the practice most.
You can do your own experiment; measure how much you are thinking at the beginning of the practice and how much you are thinking at the end. Thinking is necessary but if we can't stop then who is the Emperor of our mind? Our thinking or ourselves?
A relaxed mind is a happy and creative mind, we have our best ideas, and are more functional in our day to day life when we are relaxed.
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