Photos: Footlocker Cross Country Championships

Forty of the best high school boys cross country runners in the U.S. take off from the starting line. Photo: Scott Draper/Competitor

Balboa Park's Morley Field is an iconic cross-country venue in the United States. Photo: Scott Draper/Competitor

Sophia Chase of Virginia is introduced to the crowd. Photo: Scott Draper/Competitor

Bobbie Burgess of Indiana bumps hips with team captain Jorge Torres during pre-race introductions. Photo: Scott raper/Competitor

Forty of the best high school girls cross country runners take the starting line. Photo: Scott Draper/Competitor

The girls race is underway! Photo: Scott Draper/Competitor

Marissa Williams took thee girls pack through 400 meters in 66 seconds. Photo: Scott Draper/Competitor

Forty of the best girls cross country runners in the U.S. make their way around Balboa Park's Morley Field. Photo: Scott Draper/Competitor

Girls pack runs together mid-race. Photo: Scott Draper/Competitor

Anna Rohrer takes charge after the 2-mile mark on her way to winning the girls race. Photo: Scott Draper/Competitor

A fast start quickly strung out the girls race. Photo: Scott Draper/Competitor

A chase pack makes their way around the Balboa Park course. Photo: Scott Draper/Competitor

Sophomore Anna Rohrer breaks the tape in 17:25. Photo: Scott Draper/Competitor

Girls champion Anna Rohrer is helped through the finishing shoot. She was OK, just a little spent. Photo: Scott Draper/Competitor

Reigning champion Edward Cheserek is introduced to the crowd. Photo: Scott Draper/Competitor

West team mentors Ryan Hall and Meb Keflezighi jog out for pre-race introductions. Photo: Scott Draper/Competitor

Runners ran 5,000 meters over grass and trail at San Diego's Morley Field. Photo: Scott Draper/Competitor

Lead boys pack. Photo: Scott Draper/Competitor

A large group of boys stayed in contention for much of the race. Photo: Scott Draper/Competitor

Edward Cheserek of Newark, N.J., repeated as boys national champion. He covered the 5,000m course in 14:59. Photo: Scott Draper/Competitor

Ryan Kromer of Hudson, WI, finished eighth in 15:30 for the 5,000m course. Photo: Scott Draper/Competitor

Cross country is hard. Photo: Scott Draper/Competitor