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I think of the ball whack comparison to taking up the slack of my skin in the heel chord barbell scenario. I literally have no extra skin to work with. So when I ball whack my skin I feel nothing changing really. Same with smashing my heel chord against the barbell. When I say “hurt” I mean more like tender tissue pain — you know the pain cave. I feel like as I go along with mobilization I know what normal tissue feels like. I would say my heel chord feels normal, but when I go in the position of restriction such as down in a squat I have very very tight skin and hard muscle right around the ankle/heel. It feels like there should be more sliding surface there to give me more room.