I go to the gym monday through friday. saturday i started having some pain in the middle of my spine. my right shoulder blade is achy when i move it. ?

Shouder: It is possible that while you were working out human have strained some of the muscles that surround the shoulder including the latissimus in the Levator scapular muscles, This sounds more like a stri of the muscles in that area as opposed to anything of significance. Anti-inflammatory medication and either heat or ice would be beneficial and maybe taking a break from working out to allow the Area