Same as Mike, pretty much. I've been "training" for LD on my geared bike for years, which really just means a couple hours a day after work, and 50-150 mile rides on weekend days. I switched to fixed gear almost exclusively a few months ago, and really haven't changed anything in the "training" routine. Food, drink, everything else have been about the same as well. My crotch had to toughen up a bit...