It took her fourteen hours, but she did it.
The United States took a disappointing fifth.
Japan hopes to show the world that it can recover from the devastating tsunami earlier this year.
Previous sensors weighed up to 13 pounds.
He had finished second in the past two years.
The times were slow due to the challenging conditions.
Participants can pledge to do a 4-mile run or walk between May 1 and May 22, wherever they are.
She is recovering from a hamstring injury and wants to be near her family.
Tokyo runners find joy in a group workout despite the recent disasters in their country.