During one of my training sessions on last sunday, i did a 45 minute shadow which involve a lot of smashing, smashing air of course, so i decided to use my friend's super heavy old type of squash racket with added weight. He placed metal wires and spin it through the holes of the racket between the strings basically making the top really heavy. Could be 2-3 kgs which is like 4-6 pounds. it was hard to swing at first but bared with it. Swinging it for just 5 times, its already really exhausting. After that, it my upper back (traps) started to hurt if not mistaken. On Monday, it started to hurt even more especially when eating when u have to raise your arm, this pain continue till today which is now ,thursday. I just want to ask has anyone experience this before? and ways to make it heal faster. And i would like to know what type of injury this is? i cant seem to find it in this forum. I already try hot compress and ice compress.I find it weird that it has to be that part which got injured but not my arm. My arm is totaly fine without even a slight muscle pain. My first assumption is this injury http://www.sportsinjuryclinic.net/cybertherapist/back/upperbackneck/tightmuscles.htm Any suggestion or help or sharing your experience would be helpful.Thank you.