The charity swims in this section are mostly challenges which take place over a number of days - such as swimming the equivalent of the English Channel, but in your local pool and in your own time.
If you're after single-day events then click here.
And if you'd like to learn more about any of the challenges then simply enter a few basic details to get instant access to further information.
To refine your search, click + on the blue filters.
If you would like to do this as a group and there are more than 15 of you, we can help you find a reputable organiser to sort everything out.
Simply complete the form below and we'll be in touch shortly.
Want to list your challenges?Find out about advertising here
Sign up now & get the latest event updates in your Inbox every week!
Inspired by the London Marathon? Now's the perfect time to get into running.
It's Easter and we highlight some ideas for weekend warriors in 2017 as well as the best events to go and support them.
Go the distance with these extreme runs, rides, walks and triathlons in the UK and around the world.
Is this the ultimate year-round multi-activity destination?
Things to do in an urban environment - everything from city walks to traffic-free rides.
3 June - The perfect family day out
Westminster 10K - 9 July
All abilities welcome - 3 June
Liverpool Half Marathon - May 28
Ripley Castle – 2 July
Llandudno Sea Triathlon - 25th June
10K Enchanted walk -
10 June - 50km or 100km routes
2nd Biggest Triathlon in the UK
70 miles - 17 June