When you crane your head and neck forward to say, look at a computer screen, the muscles in your upper back strain to hold up the virtually added weight of your head. The more horizontal alignment of your neck vertebrae cause your head to position itself back so you can see what you want to look at in front of you, causing the muscles in the neck to shorten as well. You can also see what this does to the mid and lower back, which further affects the rest of your body and how it functions as a whole. You can avoid this by keeping an awareness or a mindfulness of your body and posture, especially while you are sitting at work or in your daily commute.
