Conversation so far:
where is the oblique muscle located in the body
The external oblique muscles are located on the outer surface of the sides of the abdomen, on each side of the rectus abdominis.
What is the purpose of the external oblique muscle?
The external oblique functions to pull the chest downwards and compress the abdominal cavity

Question: Is there an inverse muscle?
Self-contained rewrite: Is there an inverse muscle to the external oblique muscle?