I'm cycling 55 miles from Annan in Scotland to the Lake District to raise money for Brain Tumor Research. It's part of a giant work relay race through the UK involving running, swimming, canoeing and even dog-walking. But I get to wear the padded lycra shorts. Apparently there are mountains on our route across the border, which I'm not happy about. We're paying our way up there and our agency has paid for the support car so every penny you donate goes towards fighting brian tumours, which is obviously a good cause. I promise to sponsor you back if you do something that causes you similar personal discomfort.

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.