I once tried open water swimming and I loathed it. I don't like the idea of creepy water creatures biting my toes and I hate choppy, cold water in my face. So I swore I would never, ever take part in an open-water triathlon.

But then a Twitter pal asked me to join a team of wannabe triathletes taking part in the London Triathlon 2011 for an important cancer charity. She asked if I'd do the triathlon (which includes an open water swim.) I said: "No way!". Just a few hours later (and after some cajoling) I suddenly found myself saying: "Yes, why not?! It's for charity!".

So now I've signed up to do the Olympic distance London Triathlon. That means a 1500m swim in freezing cold Thames water. If I get through that the 24 mile cycle followed by the 10k run will surely be a doddle?! I think not!

It would be fantastic if you could spare some money to sponsor me to take part in this daunting event - and to raise finds for a very worthwhile cancer charity.

Donating through JustGiving is simple, fast and totally secure. Your details are safe with JustGiving – they’ll never sell them on or send unwanted emails. Once you donate, they’ll send your money directly to the charity and make sure Gift Aid is reclaimed on every eligible donation by a UK taxpayer. So it’s the most efficient way to donate - I raise more, whilst saving time and cutting costs for the charity.

So please dig deep and donate now. Thanks!