When you start running farther than 18 miles at a time, you might encounter unexpected difficulties. These difficulties could vary from sudden large blisters on your feet, to aches in your stomach, to skin rashes, to dramatic slowing in your pace. Don’t be overly concerned about any of these, especially if this is your first time running that distance. Fortunately, you still have several weeks to go and two more opportunities to run long distances before your race. Take advantage of these opportunities, and find out what surprises you might face.