The Tai Chi principles are the distilled wisdom of hundreds of years of direct experience (and careful preservation and transmission). Manifesting the principles in the physical form is the beginning step of learning to apply the principles in your daily life and this is where meaningful change will occur. They are a direct connection to the laws of nature and to the harmony with nature that is your birthright.
Relax and Sink
First, relax your neck and shoulders and bend your knees.
Next, relax your chest and abdomen and sink your breath.
Then, relax (calm) your mind and sink it with your breath to your center.
Spine Upright and Open
Maintain verticality as if suspended from above.
Open means relaxed and not twisted.
You literally turn your waist to initiate physical movement.
Also, center your breath and your heart/mind.
Differentiate Yin and Yang
Initially, this means to separate your weight by sinking down on one leg at a time.
Wrists Relaxedly Straight
Keep your wrists and hands straight and relaxed.