I was just finishing up another chapter in my ISSA CFT text. I decided to go peruse the ol' Facebook and I saw this dumb girl with a picture of her arm extended. It was hyperextended quite a bit at the elbow, and someone commented how her arm looked weird. She replied "I'm double jointed you dumbass."
This made me remember all those weird things we'd do as kids, like popping thumbs, locking fingers in weird positions, crazy hyperextension of joints, etc.
Now that I know way more about the body, I want to know what that's all about.
The kids would ALWAYS say something about being "double-jointed." What does that mean? Is that even accurate? What's really going on here?