be confident

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They hold their head like they're balancing something on their chin—à la F. Scott Fitzgerald's Jordan Baker.
Research has shown that "power poses," like standing tall with shoulders pulled back, chin up and not tucked into your chest, can boost your levels of testosterone (the hormone linked to having a sense of power and self-confidence) and lower the levels of the stress hormone cortisol. (In photos, this power pose helps you avoid looking like you have a double chin).
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