What got me thinking about this was reading about Walter George. Over 120 years ago he trained by doing "100-ups" (which is basically running in place) for a short time once a day, and set the mile world record at 4:12. I'm sure he did a few other things in his training but it's not very well documented. Some people said that the record would likely never be broken. Obviously we've come a long way since then and there will not be nearly as drastic of a change in the next 100 years. But it would be pretty arrogant of us to believe that everything we think we know about training is actually correct. A lot of ideas get passed along just because "that's the way i did it and the way my coach did it". There are also things that we just don't know yet and research has pointed multiple directions. For every theory and research paper there seems to be another that says something different within a few years. So what are we wrong about?