sorry to contradict the statements about hand motion solely coming from body motion, it's not really the case in salsa. There are lots of lady styling instructors who teach followers to perform various hand and arm styling in salsa, and a lot of them are independent of body motion (Duplexxy, Estillo, and many lesser knowns) like hair combs, arms up/out, finger egg or flamenco arms/hands during basic, and many more figures. Some look great when done right (at the right time), some make me wonder "what are they thinking
Anything past the point of natural movement (as duplexy does) becomes stylistc rather than what is stressed from the posts above.
I'd be the first to agree that a lot of arm/hand motion taught out there is extraneous sometimes awkward/mechanical looking, and I tend to stay away from some of it, but I don't agree that it's all supppsed to result from body movement