Stand Up Straight, Empower Your Inner Optimist

10/20/2009 05:12 am ET | Updated Nov 17, 2011

The advice that Kay Kay Magi received from her tennis coach hardly seemed earth-shattering at the time: Stand up straight throughout the match. Keep your chin up and your brow unfurrowed, even if you're losing. Project confidence at all times. But the teenage player soon found that adjusting her posture to mimic aplomb not only manipulated her opponent's morale, but her own mood as well.

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