Among the first thing you learn in your Taichi Chuan lesson is to keep your spine upright.
This is the very basic of tai chi, and fundamental to the good posture that helps you stay healthy.
Be aware, however, that you will have to keep your spine upright, not straight. The diffenence, while minute, is critical.
With your spine being straight, it becomes rigid and stiff. This prevents the free flow of chi in your body, which is essential to the execution of the Tai Chi movements. When the spine upright – rather than straight — it is soft and flexible, making the Tai Chi movements effective.
How do you make this happen?
Forget about straightening your back. Rather, lift you head, feel as if it is suspended from above by a string. By doing so, your spine will be erected in a natural way — what you will need to do the Tai Chi exercise and stays healthy.
The posture is important when you are performing Tai Chi meditation.
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Strictly speaking, Tai Chi is not an exercise.