"When I started running, I was so embarrassed, I'd walk when cars passed me," said Joan Benoit Samuelson. "I'd pretend I was looking at the flowers." However, Samuelson stuck with it (she was using running as a way to recover from a broken leg), and eventually she went on to win the gold medal at the 1984 Summer Olympics in Los Angeles.
There's that motivation to lace up your running shoes. And then, there's these ten inspiring photos from around the world.