Muscle Down the Back of One Leg
This page is the CodyCross answer for the clue below from Time for a check-up, Group 1712, Puzzle 1 (Toys for Kids).
Question is: Muscle Down the Back of One Leg
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.