The Big 100 is back for 2021 – and it’s bigger than ever!

This September, British Lung Foundation and Asthma UK fundraisers are joining forces to fight lung disease.
The challenge? Walk 100km in 30 days. Where you want, when you want.

Think you’ve really got what it takes to go the distance? Go for The Double! 200km in 30 days.

Asthma UK and the British Lung Foundation:
The Dream Team

We’re the two leading lung health charities in the UK. We’re fighting for a world without lung disease, through our research, support services and campaigns.

Whether you’re walking for Asthma UK or the British Lung Foundation, by taking on The Big 100 in September 2021 you’ll be a Team Breathe Hero.

Are you ready?

Take on The Big 100 and fight for the UK’s lungs

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Sign up!

Your JustGiving fundraising page will be ready in 2 minutes

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Set your target

£100 gets you a limited-edition water bottle and £200 earns you a bespoke medal

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Shout about it

Share your fundraising page to get support from family and friends #TeamBreathe

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Track your kilometres

Strava or manually. Start your challenge from 1st September!

Where you want, when you want

Take it slow and steady, racking up KMs while out for a weekday dog walk. Or speed ahead to your target distance with a long weekend ramble! Make The Big 100 work for you.

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Improve your fitness

A personal achievement to be proud of

Raising money to take us closer to a world without lung disease

£100 could fund a day of life saving research for Asthma UK and the British Lung Foundation.

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"Super proud of myself! I had a double lung transplant two years ago so I did this for myself, and for whoever else it can help too!"

- Lindie, who took on The Big 100 2019 and The Double in 2020.

Our Fundraisers