A wave of scientific studies spearheaded by researchers at Michigan State University (MSU) in the US found that holding power poses makes people feel more powerful, but that is where the effect ends.
"This new evidence joins an existing body of research questioning the claim by power pose advocates that making your body more physically expansive - such as standing with your legs spread and your hands on your hips - can actually make you more likely to succeed in life," said Joseph Cesario, MSU associate professor of psychology.
None of the studies showed positive effects of power poses on any behavioural measure, such as how well you perform in a job interview.
The studies were also reviewed by Dana Carney, a University of California Berkeley professor who was one of the authors of the original power pose research.
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Cesario and MSU graduate student David Johnson also published four new studies testing whether holding power poses impacted important behaviours such as how well you do in a business negotiation.
"There is currently little reason to continue to strongly believe that holding these expansive poses will meaningfully affect people's lives, especially the lives of the low-status or powerless people," Cesario said.
Led by Carney and Amy Cuddy from Harvard University, the original power pose study, in 2010, suggested that holding such poses can make you more likely to succeed in life, especially if you are "chronically powerless because of lack of resources, low hierarchical rank or membership in a low- power social group."
When you are alone before the interview, Cuddy recommends, hold a power pose for two minutes - whether that is standing with hands on hips, leaning over a table with your fingertips on the surface, or perhaps seated with your feet on the table and your arms folded behind your head.
Researchers found that holding power poses makes people feel more powerful, but that is where the effect ends.
"Feeling powerful may feel good, but on its own does not translate into powerful or effective behaviours," Cesario said.
"These new studies, with more total participants than nearly every other study on the topic, show - unequivocally - that power poses have no effects on any behavioural or cognitive measure," said Cesario.
In several of the experiments by Cesario and Johnson, for example, participants watched Cuddy's TED talk, held a power pose and then completed a negotiation task with another participant. The participants who held the power poses did no better than their partners.