James Brown was one of the three greatest dancers among pop performers I've ever seen. He was also, at one point, known as "the hardest working man in show business." This is an early video of him singing I Feel Good, one of his trademark songs. I've never seen footwork quite like this:
This one is called James Brown gives you dancing lessons:
What's evident from these videos is that Brown could have been a world class sprinter, boxer, or running back. His power, speed, control, and balance are all impressive.
He probably led a better life for having been a world class singer and dancer though.