Today while i was practicing my serve, i pulled a muscle near my right lower shoulder blade area. I guess i didn't warm up enough perhaps. What is a good warm up routine asside from stretching to prevent this injury from occuring? Also, I have been rubbing a lot of bengay and iced it when i got home. It doens't hurt asside from when i turn my shoulder into the serving motion or raise my arm substantially. I hope it isn't serious? thanks.