Three weeks away from the 109th running of the Boston Marathon, it’s a bit late to start training, but for those who have qualified for the historic 26 mile, 385 yard contest, there are still some tweaks that can knock a few minutes off your time. Tapering, or reducing one’s daily distance, should start about two weeks before the race. This excellent marathon training site, appropriately named Marathon Training, offers a helpful explanation of tapering, and includes a chart with a recommended tapering schedule. There is plenty of other good advice here too, such as this bit of wisdom that is so obvious that it is often overlooked: don’t forget to clip your toenails.