Movement basics

Flexibility

The available range of movement around a joint, influenced by the muscles and other tissues around it.

In everyday words

A calf stretch involves the ankle moving while the calf muscles lengthen.

What to keep in mind

Flexibility and mobility overlap. The useful distinction here is available range versus actively controlling movement.

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Movement basics
Mobility
In exercise instructions, mobility usually describes the ability to actively move through a range with control.
Movement basics
Range of motion
The amount of movement available at a joint, such as how far an elbow can bend or straighten.
Movement basics
Hip hinge
A movement pattern in which the hips bend as the torso tips forward and the hips move back. The knees may bend too.