Researchers from San Francisco State University had 110 college students either walk down a hall in a slouched position or skip. The results? The slouchers reported increased feelings of depression and lower energy than skippers.   That’s no surprise to posture expert Carol Krucoff, a yoga teacher and author of Healing Yoga for Neck and Shoulder Pain. “Even our language reflects this connection between proper posture and emotional affect—someone weak is called spineless and someone proud has backbone,” she says. [sidebar] The fix: Imagine there’s a headlight right in the middle of your chest at the sternum (breast bone), says Krucoff. Sitting or standing, your headlight should always shine forward. Now, keeping your head centered over your shoulders, extend your head toward the ceiling without lifting your chin.