Can standing in good alignment really be considered an exercise? Actually, it's an important habit to develop with daily practice. Good posture isn't just to look good, it balances all joints of the body so you can move with ease and comfort. Additionally, being in line helps you make better decisions.
Research done at the University of Aberdeen as reported in the New York Times article, Abstract Thoughts? The Body Takes Them Literally, notes that people who are thinking about the future lean forward and when recalling the past most people lean back. Being in alignment helps a person be present. Letting go of bad posture habits helps us make better sense of what's going on around us.
So spend a few minutes every day standing with focus on alignment of your hips over your ankles, your ribs over your hips, your cranium over your ribs with your shoulders and arms relaxed. Ground firmly to the earth below you, as though you have deep roots and draw a line of energy up your inside arches and legs, through your spine so the crown of your head subtly lifts toward the heavens. Stay in this space, the present moment, for as long as you can hold your attention here. I practice this when I'm waiting anywhere, such as when my computer is starting or when standing in line at the store or bank.