Flexibility is available range
Flexibility generally describes how much a muscle and surrounding tissue can lengthen, often measured in a passive position. Static stretching can be useful when the goal is to improve tolerance to a lengthened position.
Mobility adds control
Mobility is the ability to actively move a joint through useful range with control. It depends on flexibility, but also strength, coordination, stability, and motor control.
Why the distinction matters
A person may be able to reach a position when gravity or a stretch helps them, but struggle to control the same range during a squat, lunge, press, or athletic movement. That gap is often where targeted mobility and strength work becomes valuable.
How to train both
Use dynamic movement before training, strength exercises through comfortable ranges, controlled end-range work, and static stretching when appropriate. The right mix depends on what is actually limiting the movement.
Do not chase range for its own sake
More range is not automatically better. Useful range is range you can control and use without pain. If a movement produces persistent pain or neurological symptoms, get evaluated rather than trying to stretch through it.
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