Is it a possibility Dumbell flys caused me to pull the muslce on my shoulder blade..i pretty much sprained it..couldnt even walk from the pain and all the nerves became into a lump...now its gone..just a minor pain..
back muscles are a stabilizer during dB flyes. its possible, but if that's the case, it's because you tried to use too much weight, or your back is under-developed for the amount of weight your chest can move.
