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It’s Not The Walking. It’s The First Ten Steps After You Stand Up.

Make sure your sound is turned on and wait up to ten seconds for the video to load.

You get up out of the chair and the first few steps are careful and shallow. Your hand finds the arm of the sofa without you deciding to put it there. A minute later it has loosened off and you get on with the day — until the next time you sit down.


Most people put that down to worn cartilage and assume it only goes one way. The presentation below argues something different: that the stiffness has less to do with the cushion inside the joint and more to do with the fluid that keeps it slippery, and that this fluid changes with age for reasons unrelated to how far you have walked.


Whether that holds up is for you to judge. It runs a few minutes and explains the mechanism in plain language.

Opens the advertiser’s website. Nothing is charged for watching.