Sign up here for our Virtual Royal Parks' London Half Marathon Challenge and run/walk one kilometre for each of our 21 conservation projects. Your £21 registration fee covers the cost of the platform (£6) with the rest going to our 21 For 21 Project Fund. To find out more about the 21 projects you'll be supporting click here.

There is no set date for this challenge - it is available to be enjoyed throughout 2021 at a time and place to suit you. Complete the challenge in one go, or in stages.

You and your supporters can follow your progress on a real-time map as the distances you walk/run are tracked by the app Strava. You will be shown how to set this up when you register for the event.

As you pass important milestones and landmarks we will email you a progress update.

If you raise more than £250 you will receive complimentary membership of the Explorers Against Extinction Explorer Club for a year, giving you exclusive updates on the 21 For 21 campaign, a free ticket to the Explorers Against Extinction annual event at the Royal Geographical Society, London in November and other benefits.

>>>To explore other active challenges you can do in aid of 21 For 21 please click here.