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11

Brinol et al (2009) suggest that your intuitions generalize. From the abstract: Building on the notion of embodied attitudes, we examined how body postures can influence self-evaluations by affecting thought confidence, a meta-cognitive process. Specifically, participants were asked to think about and write down their best or worse qualities while ...


8

The other answers cite minor effects related to your phenomena, but there's something more pervasive going on. In Carney et al's research report "Power Posing: Brief Nonverbal Displays Affect Neuroendocrine Levels and Risk Tolerance", it was found that "power posing" increases testosterone and cortisol levels which leads to, among other things, a greater ...


4

Yup; basically, it works. Varvogli and Darviri (2011) review research on diaphragmatic breathing, reporting: Deep breathing has been successfully used to decrease the fatigue associated with haemopoietic stem cell transplantation patients 55, to reduce the anxiety and asthma signs/symptoms of children with asthma 56, in the management of acute stressful ...


3

From my personal experience I can tell you that the most confidence you get with strenthening of your shoulders (upper back), biceps and arms in general and most importantly the core (stomach). Bruce Lee (and other fighters would agree) used to say that core muscles are the most important in fight and who will win (if the fighters are similar) depends ...



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