On 7/8/2017 at 3:48 PM, Étienne Lajeunesse said:Simplifying it : Is it possible to hold this -
- while keeping shoulder extension this way?
It looks to me physiologically impossible. I don't see how we can produce so much force from our post-delt. and surroundings to keep this complete extension.
Looking over the picture and the all of the body positioning.
1. To rephrase what Alessandro stated. Someone would dislocate their shoulder before reaching horizontal. In the picture the upper arm is being held fully internally rotated which is in one of the weakest positions for the shoulder joint.
2. As for a scaled down version, I can not think of any. Especially If the shoulder joint is going to remain internally rotated, as seen in the picture. In the "Men's Artistic Gymnastic code of points" (AKA: MAG code of points) starting at page 42-53 of the linked pdf file there is no "Reverse" planche. "Planche" itself is called a "Support Lever."
With the shoulders externally rotated, see the suggestions in the posts above.