1. Race selfies. I get it if you want to take a picture as you wait to start the race, or after the finish with your medal (I do that too - I do!). But taking a selfie during the race means that you are not paying attention to the course or the people around you. I nearly slammed into someone who took a selfie while crossing the starting line - yes the starting line - of Cherry Blossom. Running isn't pretty. There's a reason race photos - taken by the pros - are so bad. Trying to make the sport look perfect for social in a race setting is dangerous, and rude too.