Oddly Wired
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confidence

Standing tall makes you believe your own thoughts more.

A 2009 study found that participants who maintained an upright posture reported more confidence in their own written thoughts.

Your body's physical orientation acts as a meta-cognitive cue, signaling to the brain that your current state is stable and trustworthy.

Your posture is an argument you make to your own brain.

Where this comes from

Study
Brinol et al., 2009, European Journal of Social Psychology
What the check found
The study by Briñol, Petty, and Wagner (2009) is a seminal paper in the field of self-validation and correctly identifies that posture acts as a metacognitive cue for confidence in generated thoughts.
Confidence
Well replicated
confidencebody languageposture

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.