Conley has been implementing more mileage and longer workouts in preparation for Houston Half. Last year during the winter she focused on speed, but this year it's strength as her focus remains on the 5K and 10K outdoors.

Meb Keflezighi goes for the three-peat against a field that includes Josphat Boit, Shadrack Biwott, Diego Estrada and Girma Mecheso. In the women's race, marathon specialists Annie Bersagel and Lauren Kleppin will attempt to hold off U.S. 10,000 champ Kim Conley. Sara Hall and 2012 Olympian Janet Bawcom are also in the field. Races start at 6:55 a.m. CT on Sunday.