I know, I've done ultramarathons before. But this is the first one since I was diagnosed with ulcerative colitis earlier this year. I spent a couple of horrible months last winter with constant diarrhoea during which time I lost almost two stone and could barely take the bins out never mind run.

Eventually I found out the cause and have been on medication since and will be for the rest of my life. I'm very fortunate though - in more severe cases surgery is required and I'm able to live a normal life albeit with a few dietary adjustments.

It's been a humbling journey back to running fitness and I'm still not entirely sure whether this 50-miler is too soon but I'll only find out by trying so please donate what you can to encourage me to get round and more importantly support this charity.

On Saturday 12 November you can track my progress here: https://www.centurionrunning.com/live

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Crohn's & Colitis UK are the UK's leading charity for Crohn's and Colitis. Right now, over 500,000 people in the UK are living with a lifelong disease that many people have never heard of. I am running to support Crohn's & Colitis UK, and your donation can help Crohn's & Colitis UK's mission to improve diagnosis and treatment; to fund research and raise awareness.