Range of motion refers to the ability to move and the extent of movements in taijiquan. It is NOT the same as flexibility.
In taijiquan, the primary action is a rotation. In order to rotate using the human body, body parts must take actions to allow or facilitate a rotation. These actions include stretching. Stretching includes range of motion. This line of thinking will lead to a particular type of action, unlike flexibility, though there are similarities.
