All my life I knew it as "I can do a split", but recently it has come to my attention that many people refer to it as "the splits" which sounds absolutely dreadful to my ear because it defies all the rules of pluralization.
You can do a somersault and you can do "the tango" but you're not doing the tangos or the sumersaults, so, why the splits?! Additionally, it makes it very difficult to describe what sort of split you're doing. "I'm doing a front split" rolls off the tongue a lot more naturally than "I'm doing a front the splits". Anyway... I am curious if anyone knows what the origin of this odd abnormality is.