Sunday, 21st June 2026
Embrace the Season, Embrace Your Potential while supporting a great cause. This year, Runderwear are teaming up with The Robin Cancer Trust to raise vital funds and awareness for testicular, ovarian and germ cell cancers.
Support The Longest Day 2026
Take part, donate, or support the challenge through our JustGiving campaign page.
Donate on JustGivingWhat is The Longest Day Challenge?
On Sunday 21 June, the sun is up longer than on any other day of the year. We're asking runners to make the most of it.
Walk 5K with friends. Jog along the coast. Run an ultra at sunrise. Any distance, anywhere, at your own pace. There's no set route and no finish line to chase. Go solo or team up. This is your challenge, run your way.
Why we run
We're proud to support the Robin Cancer Trust, the UK's germ cell cancer charity on a mission to stop young adults dying from testicular and ovarian cancer. Registering helps raise awareness. If you want to go further, set up a fundraiser and turn your miles into real support.
Sign Up & Get Ready!
Register using the form. You're entered into our first prize draw straight away.
Plan your day.
Go solo or rally a few friends. Then set up your fundraiser for the Robin Cancer Trust and make your miles count.
Make the most of the longest day
On Sunday 21 June, walk, jog or run. Any distance, anywhere. Just get outside and enjoy it.
Sign Up & Get Ready!
Register using the form. You're entered into our first prize draw straight away.
Plan your day.
Go solo or rally a few friends. Then set up your fundraiser for the Robin Cancer Trust and make your miles count.
Make the most of the longest day
On Sunday 21 June, walk, jog or run. Any distance, anywhere. Just get outside and enjoy it.