Etymology From Middle English strecching, strecchinge, equivalent to stretch + -ing.
1
The act by which something is stretched.
[Skins] must be submitted to several washings, treadings, and stretchings, before they acquire the necessary pliancy.1859, Victor Regnault, Elements of Chemistry:
2
A form of physical exercise in which a specific skeletal muscle (or muscle group) is deliberately elongated to its fullest length in order to improve the muscle's felt elasticity and reaffirm comfortable muscle tone.
Etymology From Middle English strecchinge, strecchynge, from Old English streċċende, from Proto-West Germanic *strakkjandī, present participle of *strakkjan (“to stretch”), equivalent to stretch + -ing.