Tai Chi is based on correct posture and proper alignment to make the best use of your whole body.
everydaytaichi by lucy has developed "key words" that she uses to call out as the movements are done
Flash Arms like a Fan
after Needle at the Bottom of the Sea:
Start in the middles
Push out Left arm
Pull back Right arm
Stretch out the back knee
Start in the middles
Push out Left arm
Pull back Right arm
Stretch out the back knee