I have been doing Karate for 7 years (currently in WKF Shotokan, 1st kyu brown belt, training in Canada). My sensei keeps telling me to relax my upper body and use my legs/hips for power. However, no matter how much I consciously try to do this, he keeps telling me I am too tense. I have been trying so hard for the past two years or so to relax my upper body and generate power purely from my legs/hips. I have reached a point that where I am trying so hard to relax that when I do kata, every technique I do causes my upper body to wobble and gyrate around like crazy. It almost looks like I'm drunk because of how much I'm trying to relax myself. But my sensei keeps telling me to relax even more, and at that point I don't even know what to do. I do not have any physical issues, as I am completely able to perform plyometric exercises of the legs/hips while simultaneously relaxing my upper body. But when it comes to doing any kata, it's like all of that goes out the window because sensei keep telling me "relax your shoulders." I've tried stretching, I've tried strengthening my stances, I've tried abdominal exercises, I've tried kime exercises, I've tried contracting my lats, but to no avail; sense keeps telling me "you're too tense." I have two options: a.) Just keep doing Karate incorrectly and probably never receive my black belt (as this is something that I have seen people get failed for during Dan testing). b.) Quit Karate altogether. If both of these seem like bad ideas, then someone please, for the love of God, tell me exactly how to correct this problem. "Just relax," "work on your flexibility," "make your stances stronger," are vague answers that will not help. Right now, I am looking for a precise, exact solution to this problem so that I can stop performing kata so poorly and start doing Karate like I'm supposed to. I want to know what the exact secret is to relaxing the upper body. I want to know the precise order in which the muscles need to contract, what trajectory they need to follow, the timing of the contraction, the position of my spine, the position of my foot, the timing of my breathing, etc. I need extremely precise details on how to relax my upper body and perform kata correctly. I don't care if it means spending years on shoulder conditioning, I don't care if it means taking some weird supplement, I don't care if it means getting some bizarre surgical procedure to make my shoulders more relaxed, I don't care if it means getting cybernetic enhancements to force my shoulders to relax. This is starting to get annoying and I want to fix this problem so I can finally do Karate correctly after 7 years of training.