Stretch threshold is the point of a good opening, not a sharp 📝end range, where every stretch stops.
In 📝Thai Bodywork the practitioner feels for ease, not for a trophy angle. Past the threshold the receiver braces and the stretch is wasted. The word is a dose limit, not a diagnosis of how flexible someone is, and not a claim that more range is always better. The receiver's breath and the ability to stay soft are the test.
Clients feel a stretch they can breathe in. Sharp, numb, or panicky sensation is already past the threshold. Guarding means back off.