Core of Muscle in the Stomach and Waist

This page is the CodyCross answer for the clue below from Time for a check-up, Group 1710, Puzzle 5 (Sick Patients).

Question is: Core of Muscle in the Stomach and Waist

and the answer is: ABDOMINAL

Word Meaning:

ABDOMINAL — Of or pertaining to the abdomen; ventral.

Definitions from Wiktionary.