Assertion: hamstring | /r/HasProperty | a collection of 3 muscles
Facets:
Source sentences:
text: Hamstrings are a collection of 3 muscles which are located in the back of the thigh and are responsible for bending, or flexing our knee.
text: The hamstrings—a collection of three muscles extending from your sit bones to the backs of your knees—are among the most frequently injured muscles in sports.