This is a very good test to see if you will start to have the hunchback problem or not.
Can you do this?
I injured my right shoulder in a motorbike accident many years ago so I'm a little asymmetric, but...
Right elbow up - yes, and can get the grip onto my wrist.
Left elbow up - yes, can match her grip but no further.
Sitting like that though, I can't seem to get my right buttock to touch the ground
Edit: I'll maybe try to get a pic later