It's free to take part in Run 100km in February and easy to sign up:

1. Sign up here to request your free t-shirt.

2. Once you sign up, you will receive your own fundraising page. You can personalise this page to make it uniquely yours.

3. Share the link to your fundraising page with friends, family and colleagues. Tell them about your challenge and ask them to sponsor you.

4. Run 100km throughout February and share regular updates.

5. Feel a huge sense of pride and joy for completing your challenge.

Yes. This is your personal challenge, and you can adapt it in whatever way works for you. We understand that it is not always possible to complete a challenge exactly as planned. You are welcome to reduce or increase the distance or adjust your timeframe.

You do not need to tell us unless you want to, but it is helpful to update your supporters by posting on your page.

Please note that the distance leaderboard and milestone badges are set to specific distances and run between 1 and 28 February. If you reach milestones outside this period, you can request the badges by emailing facebookchallenge@gosh.org

There is no required fundraising target, but we ask everyone to raise as much as they can.

Your fundraising page will start with a target of £223, which could fund a Play worker and the materials needed to prepare art and craft packs for children on the ward.

You can change your target at any time if you want to set your own personal goal.