I try to remember that history (dance or otherwise) didn't actually stop sometime before I was born, so today I'm flashing back to 1978 and the era of disco line dances and, happily, a flood of disco dance manuals. I still find disco music very danceable, so ever so often I play around with reconstructing a few line dances to use as warmups or cool-downs at my own dance practices.
Here's a simple one: Hot Chocolate. It's only sixteen beats long, which is a very short repeat for a line dance. This may not be the easiest line dance ever, but it's got to be high on the list! The dance might have been inspired by the group of the same name, probably best known for the mid-'70s hit song "You Sexy Thing." The source is Let's Disco, no author given, published in 1978 by K-tel International, Inc.