[_pastel]

I see this when giving and receiving form advice in a few physical disciplines. "Just relax your shoulders here and move naturally."

Physical mastery often looks relaxed, natural, and simple, because all extraneous effort has been removed. When you're training hard to reach that state, the "just" can really sting. It feels like: "not only are you bad at this, but it's simple to not be bad at this".