This challenge asks you to clock up 100 kilometres across the month of September by running, walking, jogging or wheeling.

You can split this out however you like to help you hit your target, and you can change the challenge to whatever works for you - make it harder or easier!

It’s free to take part in Run 100km in September 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 too. You can personalise this page to make it uniquely yours!

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

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

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

Whilst the challenge is called Run 100km in September, you, of coruse, don't have to run if you would prefer not too!

This is your own personal challenge so please take part in a way that works best for you. You're welcome to clock up 100 kilometres across the month of September by running, walking, jogging and wheeling. The main thing is you stay safe and have fun!

Just let your supporters know what you're plan is so they can best cheer you on!

With it being a personal challenge, you can alter the challenge as needed as we understand that it’s not always possible to complete the challenge as planned. We want you to take part in whatever way works best for you, whether you reduce or increase the distance you cover or give yourself a different time frame to complete it within.

You aren’t required to let us know, unless you wish to, but it’s best to let your supporters know by posting an update on your page.

Please note, the distance leader board and badges are set to specific distances and run between 1 – 30 September. If you hit milestones outside these dates, you can request these badges by emailing facebookchallenge@gosh.org

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

You'll see that your page is automatically created with the target of £225, which could fund five night's stay in family accommodation, so parents can stay close to the hospital when their child is in intensive care.

You can change your fundraising target at any time so you're welcome to set your own personal goal.