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? Photo: LH
2. Golden memories from 19 years ago
Members of the Golden Flatts swimming team. Who do you recognise from 2003? Photo: LH
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