I found another video of an inch the most flexible of the world! http://www.youtube.com/watch?v=50B5EUFa7a8 the boy is bent his thumb in half! so it can be 5 °!!
Greatest Assisted Backwards Bend In Top Joint Of Thumb
I found another video of an inch the most flexible of the world! http://www.youtube.com/watch?v=50B5EUFa7a8 the boy is bent his thumb in half! so it can be 5 °!!