How was your posture today at work? Were your shoulders curved and your back in an S shape, or was your head aligned with your spine and your shoulders aligned with your ears?
If you type at a desk or are on a laptop or look at your cell phone for most of the day, then you are putting great strain on your back and shoulders. To reduce this strain and improve your posture, simply look up at the ceiling. Whenever you are not typing or reading something, just look up. This will reset your posture and allow you to feel more confident throughout the day.