Which of these is NOT a range of motion exercise?

Compression is not considered a range of motion exercise because it does not involve the active movement of a joint. Instead, it refers to the application of pressure or load, which can stabilize a joint or tissue but does not promote movement through the joint's available range.

In contrast, flexion, extension, and rotation are all movements that actively change the position of joints. Flexion decreases the angle between two body parts, such as bending an arm at the elbow. Extension increases that angle, such as straightening the arm back out. Rotation involves turning a body part around its own axis, like twisting the torso. These movements are integral to the concept of range of motion exercises, which aim to enhance mobility and flexibility of the joints.