Your First Rib

Here is a simple, yet one of the most effective ways of staying in a more balanced and upright posture all day, even when sat at a computer.  
First of all, put your hands on your collar bone and then feel down underneath them to find your first rib.  See if you can imagine the structure of this rib running around your rib cage horizontally, how it connects via the ribcage to your and to the rest of the ribs below.  I have included picture below to help out work this out.  Notice how interlinked it is to the whole of the rest of your body.  Now your can use it to anchor yourself in to a more helpful posture that is beautiful in its simplicity.  
Just think of your first rib as incredibly light, as if it were full of helium and trying to float away from your spine both forwards and upwards.  Follow through with that instinctive lift of the chest both upwards and slightly forwards that results.  Notice how this also makes you sit or stand taller through the whole of your body and how your shoulders are at the same time easing down your back freely.  Amazingly, this little posture adjustment can have a massive effect which radiates around the whole of your body including impacting positively on your pelvic floor health and the way you use your feet to walk upon the ground.  Take your time to feel how different it may be for you to sit or stand in this way as opposed to how you were a few moments ago.  I hope that it may also make you feel more spacious both in your body and mind and can help to brighten your spirits.  
Please let me know if this worked for you.

I must credit the inspiration for this postural adjustment to Eric Franklin.  I have used my own imagery and developed it further but the idea was found in his very informative and highly recommended book Pelvic Power.