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(NECN: Alysha Palumbo, Boston, Mass.) - Monday's marathon may be the main event, but the entire weekend has been full of races celebrating the sport of running.
A 5K kicked off Sunday's races where more than 5,000 runners of all different ages and ability levels ran through Boston's streets.
Josh Cox of California turned in the fastest time despite deciding to enter just last night.
Cox said, "The crowd support was awesome all around Boston and everyone's cheering, cheering my name, it's just great, great fans, great organization and the race was fantastic, you couldn't ask for anything more."
Although she's officially retired from running, the first female Olympic marathon winner Joan Benoit-Samuelson laced up and joined the pack.
"It's always like coming home for me, it's just a great celebration of our sport as well as an opportunity to catch up with old friends and what I consider family in the sport," said Benoit-Samuelson.
It may not quite be the marathon but the men and women running the 5K are running quite competitively.
Women's winner Jennifer Campbell said, "I'm excited yeah, I've been trying to get under 17 all year and I hadn't done it yet so it's definitely exciting."
Running the faster paced invitational mile race proved to a be a bit trickier for the elite runners because of the conditions.
Elite men's winner Andrew Baddeley said, "I think it's deceptive on this course, I was surprised by the winning time last year I thought it was slow, but having experienced it today I can see how difficult it is to run around those corners."
Even some students selected from towns along the race route took part in one mile and thousand meter races.
Middle School Girls' winner Sonya Jampel said, "I was afraid I was going to slip because I slipped at the beginning but it was really fun and I like running in the cold because it's like refreshing and stuff."
Middle School Boys' winner Caleb Winn said, "Never had this much - state's is one thing but this is ridiculous."