Stretching is how you implement it.
An example
If you’re watering your garden, with a hose, and it knotts up, the water stops flowing.
If you pull nice n hard, or even just medium tension on the hose, the knott tightens up and the water flow Stops.
You need to shake the hose then pull, sometimes a few times, once the knott is removed, you can pull as hard as you like, and the water still flows.
Pull too hard though, and the hose rips out of the Tap, like a tendon getting ripped in its joint…