define core muscles
Photo Credit Nicolas Agustin Cabrera/Demand Media. Some of your back muscles are considered part of the core muscle group. Your lower back and the outer-middle part of your back, sometimes called your lats, are the back muscles that are also core muscles.Strong back core muscles support your abs and help you with actions like sitting up at your desk, bending to tie your shoe or reaching up to take something off a shelf.hoto Credit Nicolas Agustin Cabrera/Demand Media. Some of your back muscles are considered part of the core muscle group. Your lower back and the outer-middle part of your back, sometimes called your lats, are the back muscles that are also core muscles.