PHOTOS: 2015 Chevron Houston Marathon and Aramco Houston Half Marathon

HOUSTON -- Whether they ran for charity, for a personal best or another worthy cause, the participants in the 2015 Chevron Houston Marathon and Aramco Houston Half Marathon gave it their all.

About 25,000 runners took to the streets of Houston on Sunday, January 18, 2015, as part of the city's largest sporting event.

The streets were lined with plenty of enthusiastic spectators, watching for the friends and family, and cheering everyone on.