Starting in the 1930’s American “big bands” played a kind of music called SWING which was bounding, rhythmic form of jazz and was meant to inspire people to dance. Even during the darkest days of World War II–maybe because the days were so dark–American youth flocked to nightclubs and danced with wild abandon.
In the process they invented steps like THE LINDY HOP, which developed as a big band-era interpretation of THE CHARLESTON, which itself was a signature dance of the
‘20s. The Lindy Hop is an exuberant move characterized by a “swing out” (sometimes “send out”) during which partners flail outward away from each other and then flail
just as enthusiastically back.