Choose Your BIG Swim Challenge
Pick your distance and sign up now to get your free T-shirt!
Dive into a 5, 10 or 15 kilometre swim or set your own goal – it’s your chance to make a splash, make a difference and feel good this September!
TBS - Choose your Big Swim Challenge
5KM SWIM
Dive into a 5km challenge this September. Channel Tom Daley's Olympian mindset, dig deep, do good and feel good for Sport Relief.
10KM SWIM
Make a splash and tackle 10km in September! Give it your all like Billy Monger during his IRONMAN challenge, and swim to that finish line.
15KM SWIM
Go big this September and challenge yourself to 15km. Grab the goggles and unleash your inner Davina – you’ve got this!
15KM SWIM
Go big this September and challenge yourself to 15km. Grab the goggles and unleash your inner Davina – you’ve got this!
5KM SWIM
Dive into a 5km challenge this September. Channel Tom Daley's Olympian mindset, dig deep, do good and feel good for Sport Relief.
10KM SWIM
Make a splash and tackle 10km in September! Give it your all like Billy Monger during his IRONMAN challenge, and swim to that finish line.
What is The BIG Swim?
The BIG Swim is a virtual swimming challenge taking place in September 2025. Across the month, swim 5km, 10km or 15km – or push yourself even further! We’re talking lidos, lakes, pools and more, clear headspace, and that glorious “I did it!” feeling - all while raising money to help people get the support they need to take care of their mental health and wellbeing.
Sign up right now to get your free Sport Relief T-shirt and fundraising pack, and raise £200 to get your hands (or head) on your very own Sport Relief Swimming Cap!
Jess (11) and Sophie (9) finished their BIG Swim challenge in 2024 and swam 5.9km, raising £290 between them. Well done Jess and Sophie - you're both amazing!
Every Splash Counts
Once you’re signed up, don't forget to share your fundraising page with friends, family and far and wide, to get those donations powering your challenge! Remember, if your challenge raises £200, we’ll send you a free Sport Relief Swim Cap – to really make you look the part!
By diving in this September, you’ll be helping to fund vital projects, like Open Minds Active & The Wave Project, who support the mental health of those in need, through swim and surf therapy.
TBS - Cards 1
£10
could provide two swimming lessons for a woman in need of connection and support.
£25
could provide a week's bus pass for one volunteer to help support local swimming programmes.
£70
could give two women access to a life changing six week learn to swim programme. Building confidence through connection and giving something new a go!
Let’s get swimming - for mental wellbeing, for Comic Relief, and for a big splash of silliness. Thank you for being a good sport!
FAQs
To take part in the challenge please click the sign up button on this page, choose your distance and complete the registration form. We'll then get your t-shirt in the post and it’ll be with you within 2 weeks of registration.
There is no minimum fundraising amount for this challenge, we just ask you raise what you can – aim high, you’ll be amazed at what you can achieve. Each fundraiser is set to £150 but you can edit this amount as you wish.
When you join the Facebook group and register you’ll have access to all our digital resources including a distance tracker to help you keep track.
No, but please don’t forget to share your pictures with us in the Facebook group.
This challenge is flexible. A reasonable level of fitness will be required but it should be accessible to most. Please speak to your GP if you have any concerns.
The Facebook group is for over 18’s only. If you are under 18 and would like to participate, please ask a parent or guardian to get in touch with us.
Once you’ve registered, please allow around 2 weeks for your t-shirt to arrive.
Yes! Grab your friends, family or colleagues and make it a team activity, or even friendly competition. We’d encourage you all to complete your registration to make sure you get your t-shirts quickly. We recommend you share just one of your fundraising pages as a group.
Yes absolutely. The easiest way is to collect their donation offline and donate it to your fundraiser yourself, or if that isn’t an option then direct them to your Sport Relief Fundraising Page (created for you when you register).
If you type in ‘Fundraiser’ in the Facebook search bar, it should come up. If you still can’t find it, please ask the admins in the Facebook group.
If you have fundraised on an online fundraising page, all donations will automatically come directly to Comic Relief. If you have any offline fundraising to pay in, we would suggest paying this in to your own account and then paying onto your fundraising page yourself. If you’d prefer to send us offline fundraising in a different way please email fundraising@comicrelief.com and we’ll send you the details you need.