Scenes from the weekend at Rock 'n' Roll Philly.
For starters, she took second at the U.S. Half Marathon Championships last year.
Check out these great shots from the city of Brotherly Love!
It was a Kenyan show of force on the streets of Philadelphia on Sunday morning.
Injuries force two top female contenders to the sidelines.
The Olympian will use the Rock 'n' Roll Philadelphia Half Marathon as a tuneup for next month's Chicago Marathon.
Loaded women's field highlights the 35th edition of the U.S.'s fastest half marathon.
It was "just" a marathon training run for her.