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That grip strength falls apart when you meet climbers. I know we are outliers in general population but it overall seems like a poor measure with tons of corner cases which invalidate it.

Older marathon runner can have a baby pinch due to not using his/her hands for any sport, yet somehow I doubt they fall into same category as some morbidly obese 250kg ball of fat who didn't move from the bed in past few years.

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I'm not convinced climbers ruin the grip strength metric that much. Yes, as a climber your grip strength will be proportionally stronger when compared to other metrics. However, this also means that you climb regularly, which involves a lot of other muscles, balance, and lots of hiking if you do it outdoors.

It's used as a proxy for overall strength, as it's very easy to measure in a clinical setting and there is a good amount of data floating about with it.

A bit like BMI, it could be useful for looking at in overall populations even if there are pockets where it doesn't measure overall strength in an accurate manner.

It's not saying if you train your grip strength you will live longer, but _generally_ those that live longer have greater grip strength than those that don't.

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