She is the older sister of two-time Olympic gold medalist, Tirunesh Dibaba.
She has finished in the top 10% of women at the Boston Marathon.
She had tested positive for EPO in 2009.
The 2004 Olympic silver medalist is running to win.
He wants to become the first American male winner since 1986.
He says the key is to stay healthy.
She hopes to use the London Marathon as a springboard.
They've known each other for 15 years.
Competitor Magazine’s editor-in-chief Bob Babbitt had 2009 New York City Marathon champion Meb Keflezighi on his weekly radio show to