The head moves but the body does not. What am i doing wrong?
The Head is independent (i.e., the "+" in front of the name), but the Body isn't.
In the artwork file, try removing the "+" from the Head layer, but also move the "Body" group within the "+Martin" group (i.e., so it's just below and at the same level as "Head"). Also, you shouldn't need "Body" nested inside another "Body" group. See if that helps.