With all due respect, I disagree. Rock'n Roll is a dance; it is an East Cost Swing derivative. It is best danced at speeds of 46 to 52 beats/minute.
I have competed in Rock'n Roll for several years, both on a national level and an international level. What distiguishes Rock'n Roll from East Coast Swing is the execution of the steps; the tripple steps are substituted by kicks toward the flour while jumping on the other foot. The rock-step is substituted by a kick-ball-change sequence (for the male partner, the kick is with the left foot downwards, the ball is on the right foot, and the change consists in putting the weight of the body on the ball of the left foot; for the female partner, exchange the left foot with the right foot, and for those who like that style, kick diagonally outwards with the right foot).
These steps are very athletic, since during this jump/kick sequence, bent legs serve as shock absorbers in order to keep shoulders at an almost fixed distance with respect to the floor (that is, keep the shoulders from oscillating vertically). To acquire an elegant look with these steps, it takes approximately two years of training!
During the fifties, Rock'n Roll has revived the "swing aerials", with even greater audacity. Often, outdstanding female partners who execute aerials are fine gymnasts. It takes approximately 4 to 5 years of constant training in Rock'n Roll + aerials to reach a relatively proficient level of execution (the timing is essential). Aerials are a specialty per se. They should never be executed by beginners without qualified instruction and the presence of spotters. This is to protect the female partner from potential injury (she is the one who performs the most difficult acrobatics with the help of her male partner).
I hope this short note is of help.