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why does some people can move there thumb to back?
Many people have flexible or loose joints. They’re the people, maybe like
you, who did gymnastics or ballet when they were young and are “good” at yoga.
Their joints move farther and more easily than most people’s joints, so they
often can do tricks like bending their thumbs forward until they touch their fore-
arms. Sometimes these people are called “double-jointed,” and some may even
have dislocated or popped their joints out of the socket. The medical term for
joints that move too far is hypermobility, and the word for joints that are too
loose and move too easily is laxity.


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