Ballroom dancing saw a resurgence in popularity in the late 20th century. Specific dances like the Charleston, jitterbug, and twist were popular in different decades from the 1920s to the 1970s. While ballroom dancing declined in popularity from the late 1950s, membership in dance associations and competitions has increased, especially among those under age 45. Ballroom dancing is now recognized as a potential Olympic sport called dance sport, requiring athletic skills like stamina, coordination, and cardiovascular strength.