AUSTIN -- Thousands competed at the Circuit of the Americas track in Elroy on Sunday, not in cars, but in tennis shoes as part of the second annual Formula Run.
Runners made a lap around the 3.4 mile track Sunday morning. In just two weeks, Formula 1 race cars will zoom around the same route.
It's a really fun race because it's a perspective hard to get from the grandstands, said race organizer Paul Carrozza.
[It's] a cheap way to see the race course without actually getting a ticket to the race, said runner Mike Bradley.
The U.S. Grand Prix is Nov. 15, 16 and 17 and will attract race fans from all over the world.
The Formula Run benefits an organization called Superhero Kids, which was founded in 2009 and addresses quality of life issues for children and their families battling cancer and blood disorders. Superhero Kids provides financial assistance to help families with non-medical needs and helps the Children's Blood and Cancer Center of Central Texas at Dell Children's Medical Center provide non-medical programming.