Forums General KStar on Avatar bow string position Re: KStar on Avatar bow string position

AvatarAydan Mcmahon

I think you’ve hit on the answer already in terms of where the force is generated.  Any wind up for an overhead strike or throwing motion or, even a dumbbell snatch will travel through that internal rotation zone because it is the most efficient path, but then end up in a solid externally rotated position when the main force generation from the joint occurs.  

The reason the bow is a fault is because the force generation portion of the movement is drawing the bow back.No coach would ever tell you to pause and hold in the internally rotated portion of a snatch because it is likely to cause injury.  When the Avatars draw their bows they are doing exactly that.  It would also make them more vulnerable to a side attack in a war type situation because they are blocking their vision and their arm is basically useless for any type of blocking when it’s all wound up. Your hatchet idea is intriguing though.  I guess the real question is, do any native groups actually draw a bow in that position?
My best guess for why they did it in the movie was to illustrate how the avatar people are so much like humans, yet so different.  Since they are imaginary people in an imaginary world, it is entirely possible that they have biologically different shoulder joints and internal rotation is super stable 😛
I think you are correct on the external rotation in extension for the back foot on the snatch.   Strict extension of the arm is straight back from anatomical neutral, so yes it would stay below the shoulder.  Forward is flexion, and to the side is lateral flexion.  It gets a bit fuzzy when people start crossing the definitions of extension in terms of joints with extension in the general vernacular which just means moving outward from a central location.  So you can have your arms ‘extended above your head’ but technically your shoulder joint is in flexion.  
There are internal rotations overhead in almost every front swimming stroke (disclaimer I am not a swimmer).  E.g. Front crawl: you draw your arm out of the water internally rotated, elbow first and extend the arm in the externally rotated position so that you cut the surface of the water more efficiently with the side of your hand.  Similar to a volleyball strike, the hand rotates back to neutral or slight external rotation for max pulling of water.  My understanding is that often swimmers who specialize in a front stroke don’t always rotate back properly which is why they often end up with rounded swimmer’s shoulders (muscle imbalance would contribute to this as well).
Fun discussion!  Thanks, Thor!