I was reading on the net about 800m distance running to try and improve myself in the event, and then happened to come across this ~ Yes I know this is common sense and again backed up by medical science's experiments on lactic acid build-up and also since the professionals are far from completely sprinting the entire 800m leg. However, I had also heard (quote unsourced) that many years ago (probably 50+) it was said that the 4 minute mile is physically unbreakable. The current world record in that event is 3:43. So what I'm trying to say is, it is evident that with better technological advancements in athlete training they are now able to vastly outdo the athletes 100 years ago. Does this mean it may some day be possible to sprint the entire 800m? And thus achieve what wikipedia is calling 'impossible'?