Is there truth to this term? I think there is. I've watched alot of white guys outrun supposedly "faster" black guys on a football field and it seems that the deception is in the physical construction of white bodies compared to blacks, as well as the difference in muscle composition. Just take a look at this run by Jesse Lumsden, for example: http://www.youtube.com/watch?v=fXgi7Etyaes Watch it once focusing on Lumsden's running, then one for the black "fast" DBs (which I'd say were 4.40-4.55 runners). Lumsden's style resembles a racehorse, bull, tiger or rhinoceros, while the black guys were like race dogs, gazelles or cheetahs. In other words, heavy boned, powerful and smooth; compared to light-framed and twitchy. I think when people expect to see "fast", they don't expect it to come in a big load and be smooth or fluid. The look for the black twitchy running style. Whites are built differently, so will likely have different running styles than blacks. This is especially true when the size difference is significant.