* Elongation: This is the most general term, referring to the act of making something longer.
* Extension: This term is often used in anatomy and physiology to describe the straightening of a joint or limb.
* Stretching: This is the most common and widely understood term for the act of lengthening muscles and tendons.
* Range of motion (ROM) exercise: This term emphasizes the focus on increasing the movement capabilities of joints.
It's important to note that the specific term used may depend on the context and the specific type of stretching being described.