Let’s meet some muscles of the back. Back muscles are many and their arrangement and functions are complex. Many of them are integral to maintaining good posture.
When I performed human dissections in my human anatomy studies, my favorite back muscle was the iliocostalis thoracis muscle for its beauty and bird wing appearance (Not posting a cadaver picture here because, not everyone likes that sort of thing.)
Slumping posture can weaken back muscles by overstretching them over time. Here is an easy way to perform the yoga pose, Cat Cow, while at your desk, to both stretch and strengthen those beauties.
PS: If you want to see what I mean, I’ll message you the cadaver photo.