Astley Park in Chorley was filled with a sea of pink as more than 600 children pulled on matching T-shirts and their running shoes.
They took part in the INEOS GO Run For Fun event on Wednesday, cheered on by Olympic steeplechaser and Holy Cross High School teacher Stuart Stokes and heptathlete Danielle McGifford.
The event was part of a mass running campaign for children, aimed at getting them off the couch and away from the television to get active and have fun.
Following the London 2012 Olympics, events are being held around the country to encourage grass roots participation and inspire the next generation of sporting talent.
Gemma Stokes, school sport partnership manager in Chorley, said: “I’m convinced that events like this will have a positive effect on our students.
“It’s a wonderful opportunity for them to take part in this campaign and to see that sport can be fun and enjoyable.”
Stuart Stokes said: “To have 600 children here, all participating in GO Run For Fun, is brilliant sight to see.
“These fun events are a great way for your kids to get out of the house and have fun with their mates running.
“We really must make sure that kids are given the opportunity to get active from an early age.”