MUSCLES is a playable word

muscle Scrabble® Dictionary

verb
muscled, muscling, muscles
to proceed by force
64 Playable Words can be made from "MUSCLES"
   2-Letter Words (7 found)
   3-Letter Words (20 found)
   5-Letter Words (8 found)
   6-Letter Words (2 found)
   7-Letter Words (1 found)