And we want to help you get into the spirit of the occasion with a look back at some archive swimming scenes from across Hartlepool and East Durham.
More than 450 pools across the UK are hosting Swimathon sessions until Sunday, including a number in the North East.
Find out more at https://www.swimathon.org
And in the meantime, let’s float back in time to these scenes from 2008, 2009, 2013, 2015, and more.
1. Diving into a 2009 fundraiser
Pupils from Manor College of Technology were joined by swimming assistant Chris Walker a d instructor Ann Preston for this fundraising event in 2009 but who can tell us more about it?
2. Golden memories from 19 years ago
Members of the Golden Flatts swimming team. Who do you recognise from 2003?
3. A 2008 memory
Members of Hartlepool Swimming Club in 2008.
4. Doing great in 2015
Members of Hartlepool Swimming Club who competed in a gala in Sheffield 7 years ago. Are you among them?
Photo: Stu Norton