Does power posing actually work? No — not the part that made it famous.
Two minutes in an expansive pose raises testosterone, lowers cortisol and improves risk-taking.
The hormonal and behavioural effects failed to replicate (Ranehill et al., 2015; Simmons & Simonsohn, 2017). Co-author Dana Carney publicly withdrew support. The subjective feeling of power does hold up.
Check it yourself: doi.org/10.1177/0956797614553946
Use it if it makes you feel better before a pitch. Do not expect anything measurable beyond that.
Every law on Useful Mind tells you how strong the evidence behind it is. The ones that failed are kept here rather than quietly deleted, because knowing which advice is wrong saves you as much as knowing which is right.
See the ones that held up