Whether you decide to go with the barefoot trend or a more classic pair of sneakers, make sure they fit your foot perfectly.
"Get fitted at a pro running store," Clayton says. "If you are serious about completing a full marathon, it's worth the investment. Spend time getting the perfect shoe for your foot. Your friend may convince you about a specific brand, but in reality a good running shoe is not a one-size-fits-all kind of deal, some are too narrow, others too wide."
Take your time, and if your shoe is bothering you during training, take it back! It will save you money, time, and pain in the long term because bad shoes = injury, Clayton says.