One for the rear delts/middle traps: areas that are often neglected and don't get enough love and training volume.
The reverse pec deck flyes can be a great exercise for shoulder health too if performed correctly, and it can be a great add-on to your upper back development overall.
As always, it's crucial to keep the shoulderblades locked down and back throughout the entire set, for each repetition.
Don't be the classic bro who goes for the whole stack & work through momentum (drawing on the left). While you definitely want it to be challenging enough, use a load that allows you to perform 8-15 reps for a couple sets in order to reap all the benefits.
Nobody is gonna ask you "𝘩𝘰𝘸 𝘮𝘶𝘤𝘩 𝘺𝘰𝘶 𝘳𝘦𝘢𝘳 𝘱𝘦𝘤 𝘥𝘦𝘤𝘬 𝘧𝘭𝘺, 𝘣𝘳𝘰?" anyway, so make sure to pay extra attention to this exercise, putting your ego to the side.
Sit tall and stick your chest out, pulling with your elbows and making sure your shoulders stay down through the movement.
3-4 sets of 8-15 reps should do.