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comment What exercises will help me open jars?
Not exactly the answer you're looking for, but if you want to open a new jar, get a bottle opener (either standalone or the hooked thing on the underside of a can opener) and slide the hooked tip under the rim of the jar lid, then apply very light force to it. You're not trying to pry the lid off, and ideally you don't want to deform the lid at all; you just need to momentarily open a passage big enough for a few air molecules to slip through and equalize the pressure. Once you do this, breaking the vacuum seal, the jar is much, much easier to open.