2025 Tough Mudder London South

Take on Tough Mudder London South
Date: 20th September
Distance: 15km, 20+ Obstacles
Whether you already have your own place or you'd like a charity place, join Team Cancer Research UK for the Tough Mudder London South and play your part in supporting vital cancer research.
How to join Team Cancer Research UK

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

Sign up to get Team Cancer Research UK perks

Get fundraising for life-saving research

Get over that finish line and smash your fundraising target
The difference that your money makes

100 CRUK participants taking on Tough Mudder Events

Hitting their fundraising targets to raise a total of £100,000

Could fund 3 postdoctoral students for a whole year
Team Cancer Research UK participants receive

A personalised Cancer Research UK running t-shirt or vest

Support with fundraising and training to help you smash your challenge

Support in the run up to the event and on the day

An official finisher's medal for completing your race