Two Flexor Muscles, the More Famous in Upper Arms

This page is the CodyCross answer for the clue below from Popcorn Time, Group 391, Puzzle 1 (Camera Operator).

Question is: Two Flexor Muscles, the More Famous in Upper Arms

and the answer is: BICEPS

Word Meaning:

BICEPS — (anatomy) Any muscle having two heads.

Definitions from Wiktionary.