Spinal facet joints that are open allow for greater mobility, particularly in twisting movements, while closed facet joints are characteristic of individuals with limited spinal mobility.

“you can tell look at my facettes they're closed I don't twist for well however when you Flex forward and pull a load those facet joints just Glide past one another so a gymnast by definition is someone who has a lot of mobility in their spine you will see that their facet joints tend to be open”