The Internal and External combined the Yi(mind) leads the Qi (Internal Energy) and the body follows

The Physical in Tai Chi
Relax from head to foot and breathe into each posture
Stable stance – Feet about shoulder width apart don't over step, move like it's a walking step. Don't lunge. Shoulders and Elbows relaxed. Be aware of your center from head to ground (don't lean) Don't extend your Center outside of your feet. The whole body is relaxed like a stringed puppet held together by string connections. Muscles and Tendons are Relaxed with minimum effort to stand and move

The Internal in Tai Chi (the Yi/mind leads the Qi)
Movements are performed with a calm mind and body

Think ahead of your movement to lead the Qi – Let your body be pulled into Posture like a string pulling a puppet into position not pushing from the feet. Be Stable, balanced and sink the Qi into the ground. Let your Qi be pulled from the ground through the feet and your body to the fingers into the Posture position while maintaining your Center

The Posture Connections
While one posture is nearing completion the next posture begins

This allows for the smooth transition between postures

When a posture is near completion let your mind start thinking into the beginning of the next posture. This is the Qi flow connection you see in the transition between the Yin and Yang energies depicted in the Tai Chi Symbol. When a posture reaches completion there is usually a 70%-30% weight split. There is always a transfer to a 100%-0% when moving and stepping to another posture. The energy flows continually both through the internal organs and physical body. Tai Chi aids in bringing good health and a calm mind Good Meditation is being Calm, Relaxed and Focused on all Qi/Physical movements throughout the Tai Chi Form. Like the flow of a stream move in one steady speed from beginning to end while changing into different shapes (postures) along the way.

Move the whole Body !