Muscle on Back of Thigh Susceptible to Injury
Puzzle 5 of Reach New Heights Pack
Question is: Muscle on Back of Thigh Susceptible to Injury
and the answer is: HAMSTRING
Word Meaning:
HAMSTRING — (anatomy) One of the great tendons situated in each side of the ham, or space back of the knee, and connected with the muscles of the back of the thigh.
Definitions from Wiktionary.