It makes sense that posture and movement affect musculoskeletal pain! And every sports coach, physical therapist, dance or yoga instructor I’ve met believes it! But you won’t find much published data about that. This is something where self-experimentation is *necessary*.
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Optimizing your physical environment is the kind of thing RCTs are inherently bad at testing. There are infinitely many possible types of chairs; an RCT can only compare maybe two or three.
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RCT’s are for *testing* an intervention that you’ve ideally *already designed* to work as well as possible, through a more informal iterative process.
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So even if an RCT says that some behavioral intervention doesn’t work, when the intervention is some very broad class (“exercise”, “therapy”) that doesn’t actually say that nothing in that class works.
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