
19 July 2025
Penrice Castle
Choose from 10k, 25k, 50k or 100k!

Step: 1
Decide whether you'll enter with your own place or get a charity place

Step: 2
Sign up to get Team Cancer Research UK perks

Step: 3
Get fundraising for life-saving research

Step: 4
Get over that finish line and smash your fundraising target
A new Ultra Challenge for 2025, set in the stunning Gower Peninsula. The UK’s first Area of Outstanding Natural Beauty and famous for its golden beaches, limestone cliffs, wild moors, ridges, and woodlands.
The basecamp is in the grounds of the historic Penrice Castle, with weekend camping options and the 100km challenge is a figure of 8 route made up of west & east loops which take in the best of the Peninsula, its history, and its varied, unique landscape. With 50km, Marathon, 25km, and 10K challenge options, as well as a bar & entertainment at basecamp – this will be the highlight of the season!
Take a look at the event factsheet(PDF, 3.04 MB)
30 CRUK runners taking on the Gower Peninsula Challenge

Hitting their fundraising targets to raise a total of around £6,000

Could buy an autoclave to sterilise lab equipment

We've teamed up with experts to give you the best training support and advice for your event. Whether it's your first time training or you're looking to smash a PB, we've got a training plan for you. Get training plans and advice

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We worked with Scimitar to create Cancer Research UK sportswear that’s comfortable, looks great and supports our vital work. 20% of the price of these products will be paid to Cancer Research UK. Visit the Scimitar shop