I came to comment the same as you, I saw it in the traps muscle, it's shown as one, but it is interesting to know that it has 3 parts[1], and there are other exercises more effective for the mid section like face pull.
About the "where you have the pain idea" I love it, it would be also cool to learn about the antagonist muscles.
(Disclaimer I'm not an expert).
I think a common bad posture in-front of the computer is the one that rotates your shoulders forward which overloads some muscles in the chest, which are antagonist of the middle traps, middle traps get weak, and your back falls forwards, face pull is great exercise to make them stronger.
Another common one for those sitting long hours, is the tightness of the psoas, which can cause hip problems, and knee problems if you try to run without stretching, I think the antagonist is the buttocks, that gets weak from sitting and you would need to exercise to correct the hip problems.
Don't trust my comments, I just wanted to put two examples of mechanism that I learned, but I don't have enough knowledge to explain it properly or be 100% sure this is correct, always consult with a pro.
(Disclaimer I'm not an expert). I think a common bad posture in-front of the computer is the one that rotates your shoulders forward which overloads some muscles in the chest, which are antagonist of the middle traps, middle traps get weak, and your back falls forwards, face pull is great exercise to make them stronger. Another common one for those sitting long hours, is the tightness of the psoas, which can cause hip problems, and knee problems if you try to run without stretching, I think the antagonist is the buttocks, that gets weak from sitting and you would need to exercise to correct the hip problems.
Don't trust my comments, I just wanted to put two examples of mechanism that I learned, but I don't have enough knowledge to explain it properly or be 100% sure this is correct, always consult with a pro.
[1] https://www.physio-pedia.com/File:Trapezius_animation.gif