Why not make power poses the way you behave all the time?
If these poses are so good for increasing power and improving outcomes, increasing testosterone, and reducing stress and cortisol, why not adopt these power poses as your natural way of inhabiting the world? Why only do this just before an interview - why not all the time?
What would the social impact be if you assumed dominant poses all the time, regardless of with whom you are socializing?
The experimental data would suggest that merely adopting these poses, regardless of any mental intention or thought, is sufficient to produce the desired beneficial effect. Would doing this all the time "wear out" the effect, or strengthen the effect?
Would combining a mental intention - such as doing great at a job interview - with adopting the pose amplify the effect?