London Marathon April 2023

Challenge London

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About the event

Take on London T100, formerly London Triathlon. Join the UK’s biggest city triathlon, as you swim through Royal Victoria Dock and race alongside London’s most memorable landmarks. Try the 100km distance: 2km swim, 80km bike and 18km run or choose from other event distances – all with famous landmarks as the backdrop to your race.

We'll support you all the way

Breast Cancer Now running vest or cycling jersey

Plenty of fundraising and training support

Regular e-newsletters to keep you up to date

Support from a dedicated member of the team

Why your support matters

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  • 39% of women

    Over a third of women in the UK do not check their breasts regularly for potential signs of breast cancer.

  • 55,000 women

    Around 55,000 women and 400 men are diagnosed with breast cancer every year in the UK.

  • 1 in 7 women

    One in seven women in the UK will develop breast cancer in their lifetime.

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Ask us a question

You can ask us anything about London T100. Just call us on 0345 092 0804 or send us an email.

Email us

What else is on?

More fundraising events

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