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Wes_W comments on There is no such thing as strength: a parody - Less Wrong Discussion
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More objective units of measure and the obvious causal relationship between visible muscle size and strength. Also, you bias IQ tests if you repeatedly take them, but you don't do likewise with strength tests so it's much easier to track changes in an individual's strength over time and most anyone whose lifts weights can objectively verify that he has become stronger. Lifting weights makes you stronger, therefore strength measures something real--no analogous statement exists about IQ.
Strength tests are absolutely biased by taking them repeatedly. Athletes call this "specificity".
The practice effect for IQ tests is about two orders of magnitude stronger than for strength tests. You could call this "specificity," but at that granularity, it's a bad thing.
Interesting. Can I ask you to unpack this statement? I'm curious what exactly you're comparing.
The difference between "has practiced a movement to mastery" and "has never performed a movement before" can be very large, like my powerlifter/snatch example in the other comment. But this is comparing zero practice to a very large amount of practice over a very long period of time. I would find it easy to believe that IQ tests see much greater returns from small amounts of practice.