Yoga teacher training-functional anatomy: TADASANA:STAND LIKE A MOUNTAIN.....

Have a look @ the arm/shoulder position in mountain pose: 
When you lift the sternum in Tadasana, can you imagine how the position of the shoulder joint changes with the movement of the shoulder girdle?
ps are you talking about move the shoulders back and down? This means you are activating the Trapezius and Rhomboid: The function of the M. Trapezius Part Descendens is elevation and retraction of the Scapulae and often much more activated then the Ascendens Part (retraction and depression). The Rhomboid is the other muscle that elevates and retracts, so biomechanically you do not want to activate elevation, meaning the shoulders move up towards the ears, creating tension.
Try LIFT the sternum instead and keeping the lower ribs tugged in!

Do you also see how the inclination (angle) of the shoulder joint in Tadasana is depending on position of the scapula and clavicular on the rib cage?
The SC joint (sternoclavicular joint) is part of the shoulder girdle. The AC joint (acromioclavicular joint) forms the socket of the shoulder joint. The humerus is the ball of the glenohumeral joint (shoulder joint).
The orientation of the socket plays an important role in the position of the arm, as well as the anatomical shape of the joint (bony point limiting movement).
Variations of anterior, lateral and superior occur in the socket. The little different angles of the “hanging arm” in the pictures of the several yogi’s in Tadasana have a lot of implications in other poses!
You might not be the person to lift the arms in full abduction but try a little more forward flexion/abduction and externally rotate under 90 degrees!
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