1. Relax
Sung in Chinese can be translated as relax, release the tension in the muscles, not so they are floppy but soft, pliable and alive.
2. Sink
The body is relaxed so that the weight is low and not high in the chest. This makes you more stable and balanced.
3. The chest should be relaxed, the back straightened, the shoulders sunk, and the elbows lowered.
Upper body tension should be eliminated, posture is extremely important for protecting the integrity of the body, allowing fast reactions and movements. Not the posture of a soldier on parade but that of a powerful big cat relaxed and ready to spring into action.
4. The head is held as though suspended from above by a silken cord. The lower back is relaxed, with the hips rolled forward reducing the curve of the spine.
Good posture is the key to good health; we have evolved to stand erect, with the skeleton supporting the body, allowing the organs to function efficiently. Modern life makes sitting not standing the predominant posture of our daily working life.
5. Let the mind direct your actions not muscular strength.
Try not to direct your movements with thought, your sub conscious mind manages your body all day perfectly, do not be a back seat driver and try to control it. Relax and let the movement happen, power and strength come from using the right muscles with just the right amount of muscle control. That’s the difference between internal and external strength.
6. Upper and lower body connected. The body acts as one unit.
Movement starts from the ground and moves like a wave through the body, every piece connect and working together. When fitness experts talk about core conditioning they are talking about the muscles that protect the alignment of the spine, we can move the shoulders independently of the hips at the waist; this is due to the spine flexing. The spine, and our posture, is weakest when it is bent and twisted. By fixing the hips and shoulders so they are in alignment and move as a unit with a strong stable inner core, the body is incredibly strong and can withstand great pressures. The Tai Chi Classics say:
"It is rooted in the feet, develops in the legs, is directed by the waist, and functions through the fingers. The feet, legs, and waist must act as one unit. When one moves, every part of the body is moving, and when one stops, every part of the body is tranquil so that in advancing and retreating you can find the opponent's defects and establish your own superior position."
7. Insubstantial (apparent) and substantial (solid) must be clearly differentiated.
Balance is of the utmost importance when moving or transferring energy such as walking, running, punching or kicking. As movement takes place weight is transferred from one part of the body to another, with the upper body being supported by the legs and the feet which are it’s base. This rule is describing the transfer of weight between the feet, which is only equal at the start and finish of the form, during the form weight is constantly being transferred back and forth between the legs, when the weight is on one foot it is said to be substantial (solid) and the other foot is insubstantial (apparent).
8. Concentrate on the line of vision.
Your eyes must look forward at your own eye level. When your shoulders move your head moves as well and so remains looking at 90 degrees to your shoulders. The head and body (shoulders and hips) should be considered as one unit.
9. All the movements must be connected without severance.
The movements and postures are performed slowly, effortlessly and continuously. There are no pauses, each posture is completed and then the next one begins, this movement is combined with breathing, it to never pauses or stops and is like the sea breaking on a beach it continuously moves in and out. The Classics say:
"Tai Chi Chuan is also called 'Chang Chuan' (Long Boxing) because it flows unceasingly like the great river." It also mentions the application of force is like weaving silk (long and continuous).
10. Meditation in action
In the external martial arts, there is use of tremendous external muscular force. This results in the expansion of veins and blood vessels, impediment of the ch'i, exhaustion, and panting, all of which are bad for health. When practising Tai Chi Chuan you must control your movements by tranquillity and direct the movements by mind-intent rather than by external muscular force. Then the movements will be effortless, continuous, and slow. The slower one practices (without stopping or jerking) the better. Gradually the above mentioned defects will be eliminated.