Most lifters rarely feel the individual regions of their back working. You may have never felt your mid-back experience excruciating tension. Let's change that so your rhomboids and mid-traps can grow thicker. Try this:
Cable Mid Back Pull-Aparts
Flare your elbows and squeeze your shoulder blades together at the end of each rep.
It's not quite a row and not quite a pulldown. It's a hybrid that directly pulls in the direction of the rhomboid fibers. Cramping is normal if you're not used to this. Enjoy that.
There's nothing more frustrating than committing to a training program that doesn't pan out. This is equally true for an athlete who might work hard yet still falls short of his expectations and the strength coach whose biggest satisfaction comes from the great strides his athletes make.