A group at Halecrest Elementary School in Chula Vista started walking around a track Saturday morning and will finish on Sunday.
Part of the Relay for Life, the event raises money for cancer research and helps those suffering from the disease.
For 24 hours walkers circle the track, napping briefly in shifts in nearby tents.
“We're walking because I'm a survivor,” Anissa Acfalle told NBC 7. “We’re walking for everyone we love who's left us, who's still fighting the battle and who will fight.”
The group included cancer survivors as well as family, friends and caretakers.
The Relay for Life movement started in 1985 in Tacoma, Washington, and is now done all over the world.
Organizers estimate it has raised about $5 billion to fight cancer over the past 30 years.
