Mobility is more than flexibility: train the range you can use

Range is only the first question

If you can reach a position passively but cannot move into it with control, that range may not yet feel useful in a lunge, overhead reach or change of direction. This is why Mari frames mobility as usable range rather than a contest to reach the furthest point.

The goal is not to make every joint move as far as possible. It is to explore the range your activity asks for, then build enough control to use it comfortably and repeatedly.

A practical way to train it

Start with a slow movement that lets you notice the available range. Reduce the speed or range until you can keep the movement smooth. Then add a pause, light resistance or a more active version when that feels appropriate.

For example, a supported hip rotation can become an unsupported switch; an ankle rock can become part of a split squat; a shoulder slide can become an overhead reach under light load. The useful progression is the one you can control, not simply the hardest variation.

What not to chase

More sensation is not automatically more progress. Forcing a stretch, bouncing into an end position or treating every stiff day as a problem to fix can make the practice less useful. Use a tolerable range and judge the movement across several sessions, not one dramatic attempt.