If you attache handles from side to the seat you get a suspension straps and you can do the hardest rowing with XUP.
The reverse peck deck strengthens the upper back muscles effectively and across the shoulder joint. In particular, this exercise is useful if you have a round back and your shoulders are forward.
While exercising keep your head, shoulders, hips, knees and ankles in one line. Do the exhale when your arms are moving backward.