100km Challenge

Sign up for the Herbie's Heroes Challenge

Walk for compassion. Walk for science. Walk for Herbie.

Walk 100km this summer to help create a future where no animal suffers in a laboratory.

Join the Herbie’s Heroes Challenge and take on a flexible walking challenge that fits around your life and gets you moving!

Whether you walk alone, with friends, or alongside your four‑legged companion, every step helps support human‑specific, animal‑free medical research.
Get started

Raise funds, earn rewards!

For a future where animals are no longer used in research

Every step you take helps drive a future where animals are no longer used in research — and where patients benefit from better, more reliable science. Animal Free Research UK funds pioneering, human-specific research into diseases like cancer, Alzheimer’s and diabetes, helping to accelerate discoveries that save lives and prevent suffering. See our current projects here.

By taking part, you’re also supporting our campaign for Herbie’s Law — helping to drive the policy change needed to end animal experiments for good.

1. Sign Up

Sign up to the Herbie’s Heroes Challenge!

Sign up now

2. Set up your JustGiving Page

Set up your fundraising page here by clicking the orange ‘Start Fundraising’ button (full instructions here!). Then we’ll send you your free pet bandana, so your pet can wear it with pride.

3. Track your distance

Link your Strava or Fitbit to your JustGiving page (see how here), or keep it simple with our printable tracker or a quick note on your phone.

4. Start fundraising

Complete your 100 kilometres before 30th September 2026 – for more of a challenge, try completing it in 30 days or less! You can find our fundraising tips here.

The legal bits

Challenge rules

Fundraising Terms & Conditions

Keeping it safe & legal

Need help? Have questions?

Get in touch, we’re happy to help: hello@animalfreeresearchuk.org