Don't change your shoes before race day.
First things first: Going into the race, don't change your shoes. A month or so out, you should have the shoes you'll wear in the race – and if you've put more than 300 miles on them by that point, then buy another of the exact make and model. "During your initial training, it's great to have two different pairs of shoes – brands and models – to stress your feet differently," says Stanko. But when it comes to race day, you should know the pair you're running in well. A blister will end your race.