Now of course there was a debate on who was the better, Gene or Fred Astaire. My money was and has always been on gene Kelly. Fred was good, but there was something about Gene that just drew you to him and not just because of his charm and good looks
Being an athlete Gene always danced with his upper body. Even Donald O'Conner who he worked with in "Singing in the Rain" commented on how their styles where different. Donald being a hoofer danced from the waist down and he tried to apply Gene's style to his own and tried emulate him in some ways. Donald once said he was one of the few that could keep up with Gene and be just as good as him. He understood Gene's work ethic.
Gene had a really strong work ethic. If he wasn't dancing on screen or on stage he was working out a number in his head or using his feet or he was working on some project either in process or something new in the works.
Gene once said this about dancing, "You can clock in and if you want you can clock out, but always keep the dancing shoes on."