I'm part of a group of an international 38 people who together will complete an Iron Man event for Sport Relief on Sunday 18 March. My stint is the second-to-last mile, at 8pm, along the banks of the Thames. 

Not all the runners, swimmers and cyclists know each other, but we're all united in the aim of raising money for Sport Relief. It's a great charity that funds worthwhile projects in the UK and globally.

I only do one sponsored event each year, and I'm asking for your support for this year's. Please give what you can to support me, the #IronTweeps team, and Sport Relief, in doing something positive for others. 

We'll be passing a virtual baton to each other on Twitter, starting early in the morning. You can follow the progress with the hashtag #irontweeps 

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. So it's the most efficient way to donate - saving time and cutting costs for the charity.