THOUSANDS of women donned pink T-shirts, hats and costumes to run around Hylands Park and raise money for Cancer Research UK.
Similar events happen around the country and are a chance for women to join forces to support each other and loved ones who many have passed away form the disease.
See more pictures and a video from the event here
"The day went really, really well, I'm delighted with the level of support we have had," said Gill Burgess, event manager.
"There was a little bit of rain but certainly didn't diminish anything, it's been a fabulous day and we couldn't have done it without the hundreds of volunteers that helped out, especially the Chelmsford Army Cadets, they have been absolutely amazing.
The amount of people taking part in the 10k, as opposed to the shorter 5k run, had increased on last year.
Organisers expect to have raised £323,000 once the final fundraising efforts have been counted up with just over 4,500 women of all ages taking part.
"Perhaps people are looking for that extra challenge, people all have different reasons why they are here and when you hear the backstories it's clear it means a lot to everybody," Mrs Burgess added.
"It's a totally empowering event, with real support and it a massive celebration of hope and inspiration.
"Well done to everyone who took part, it's a wonderful achievement and it's been an awesome day."
There will be one more Race for Life event in Essex this year, in Epping on July 16.
Place are still available so visit www.raceforlife.cancerresearchuk.org to get involved.
