“Tight” often leads to the recommendation to stretch. The report asks a different question first: is the person lacking useful motion, or working hard to control motion they already have? The answer can change what relief should look like.

Hypermobility is a description, not a complete diagnosis

A joint is hypermobile when it moves beyond the expected range. Some people have this trait without substantial problems. Hypermobility spectrum disorders and hypermobile Ehlers-Danlos syndrome concern more complex clinical patterns; they are not diagnoses that can be assigned from a flexibility photograph or a website questionnaire.

Research by Jessica Eccles and colleagues, including Hugo Critchley, examines connective-tissue variation in relation to fibromyalgia and ME/CFS. A separate specialty-clinic study found considerable diagnostic overlap between fibromyalgia and hEDS/HSD. Because that study involved a referred clinic population, its proportions should not be treated as the prevalence in all people with fibromyalgia. 1 2

The report’s proposed interpretation of tightness

The hypothesis is that some perceived restriction may accompany protective muscle activity around a system that needs more reliable control. That is a possible explanation to assess, not a rule that all tension is protective or all flexible people are unstable.

If this interpretation fits, repeatedly pursuing maximum range may miss the problem. A person may feel temporarily looser while becoming no better able to stand comfortably, carry a bag or control a joint during an ordinary task. The useful outcome would be more dependable function with less effort or discomfort.

Separate range, control and confidence

These are related but distinct. Range asks how far a joint can move. Control asks how movement is managed under the demands of a task. Confidence asks whether the person expects the movement to be tolerable and dependable. An intervention can change one without changing the others.

For example, a person may have ample shoulder range but find overhead activity difficult. The question is not automatically how to create more range. It may be how the shoulder behaves under load, whether symptoms suggest another problem, and which supported variation is tolerable. An individual examination is needed to sort those possibilities.

How this changes self-guided exploration

Record what “unstable” means in your own experience: recurrent giving way, difficulty controlling a task, a history of dislocations, or a different sensation altogether. Specific descriptions are more useful than adopting a diagnostic label before an assessment.

For movement work, the report favors exploring control and tolerable capacity when stability is the concern. It does not offer a universal set of stabilization exercises. Joint, injury history, associated conditions and recovery pattern all influence what is appropriate.

Where the systems connection remains open

The overlap literature invites questions about connective tissue, bodily signaling and autonomic symptoms. Association does not establish that one diagnosis causes another, and it does not imply that every symptom shares one mechanism.

The practical value of this branch is narrower and immediate: a fascia-focused plan should be able to stop pursuing looseness when looseness is not the missing capacity. The model becomes more useful when it can make that distinction.

The question to carry forward

Does greater control improve comfort without needing greater range?

Use it to inspect the sources below, compare another explanation, or shape a practical observation.

Sources & study context

Numbered links in the text point to the sources below. These articles explain the author’s adaptive-systems report alongside published research; proposals are identified where they go beyond what a study tested.

  1. Beyond bones: The relevance of variants of connective tissue (hypermobility) to fibromyalgia, ME/CFS and controversies surrounding diagnostic classification

    2021 · Observational study by Jessica Eccles and colleagues, including Hugo Critchley.

  2. High overlap in patients diagnosed with hypermobile Ehlers-Danlos syndrome or hypermobile spectrum disorders with fibromyalgia

    2023 · Retrospective specialty-clinic cohort; the sample is not the general population.

Educational publication, not individualized medical advice. Functional Fascia also sells supplements; the studies here did not test our products. Editorial and commercial context · Suggest a correction