In this video I demonstrate and explain the muscle movement pattern that appears in hypothyroid people because of a limited metabolism. It's called "Woltman's Sign", and has been recognized as early as the 1800's. But it's underappreciated now that thyroid bloodwork is seen as the definitive standard for diagnosis.
The ankle/Achilles relaxation test has benefits compared to the usual TSH/T3/T4 blood tests: rather than troubleshooting the source hormones for metabolism, it shows whether the muscle tissue itself is getting the resources it needs. Because of that, it can help identify unusual patterns of hypothyroidism, or recognize those who aren't responding well to traditional thyroid medications in spite of blood tests showing the problem as "fixed."
And in spite of not being as well-known as symptoms like cold intolerance, weight gain, and constipation, the ankle sign performs well in identifying thyroid problems. It also has some (admittedly-limited) use in identifying people with hyperthyroidism.
It can be done with nothing more than a household item like a butter knife, and I provide video references so that you can see how your ankle relaxation rate compares to people of different types.
(these start at number 24 because I've used the other 23 numbers in previous videos)