The phrase “what arms might do” is a New York Times crossword clue, and the specific clue you are seeing is “What arms might do on a final gym rep (NYT).” The widely reported 7‑letter answer is TREMBLE.

What this clue means

  • The clue is describing what your arm muscles tend to do when you push to failure on your last repetition in the gym.
  • When muscles are exhausted, they often tremble or shake because the muscle fibers are struggling to generate enough force for one more rep.

Where this appeared

  • Puzzle sources list this clue as appearing in the New York Times crossword dated January 21, 2026.
  • Crossword helper sites and blogs all agree that the answer for “What arms might do on a final gym rep” is “TREMBLE.”

TL;DR: For the NYT clue “what arms might do (on a final gym rep),” the answer you want is TREMBLE.

Information gathered from public forums or data available on the internet and portrayed here.