Run Fest at Lee Valley Half Marathon & 10k 

28th March 2021.

Start Times from 9.45am

This event is organised by Active Training World

Run Fest at Lee Valley  Half Marathon & 10k 

Visit the official website

The Lee Valley White Water Centre is a stunning venue in Hertfordshire and is surrounded by a picturesque regional park.

The event will host a 10K and a half marathon. Both events start and finish at the White Water Centre before heading out to the beautiful regional park that surrounds the centre.

The course is traffic free, flat and fast so not only can you smash your personal best but you can also enjoy fantastic scenery whilst you are doing it!

In order to maintain social distancing, both events will be held in waves with the fastest runners going first, based on their estimated run time. You will be asked for this information during the registration process.

Many people are understandably nervous regarding entering events again and we want to assure you that we take every measure we can to organise a safe, socially distanced event. To see this in action watch our video Covid-19 Safety at ActiveTrainingWorld Running and Triathlon Events

We want you to book with confidence so, if this event can no longer go ahead, and a postponement date isn’t found, you will be offered a virtual run or a refund of your entry fee. (Booking fees are non-refundable)

This is race is  extremely popular so enter now to avoid missing out!

Sunday 28th March 2021.

Waves from 09:45am

You will be able to confirm your start time by checking

This will be updated w/c  Monday 22nd March.

LOCATION: Lee Valley White Water Centre, Station Rd, Waltham Cross EN9 1AB

Online entries: Pay by major credit/debit cards


Race numbers will be collected at the the event venue on the morning of the race. Registration open from 08:00am

There will be an online race briefing for you to watch before the event. It is mandatory to have watched this as there will no pre-race briefing on the day.

The detailed pre-race information will be sent you by email in the week leading up to the event.

Please arrive in sufficient time to collect your race number but do not arrive before the designated time detailed above.


Book your place

  • If this is your first registration on our new booking platform but had an ATW account previously, your old ATW log in details are now invalid and a new account will be created for you when you book your first event without logging in.
  • If you are booking more than 1 place, please ensure that you complete the individual details for each attendee accurately answering all the questions on their behalf.
  • Please supply your estimated run time in minutes/seconds (e.g. 12.34)
Details Price Qty
Run Fest At Lee Valley Half Marathon Affilitated £27.00 (GBP)*  
Run Fest At Lee Valley Half Marathon Unaffilitated £29.00 (GBP)*  
Run Fest At Lee Valley 10K Affilitated £20.00 (GBP)*  
Run Fest At Lee Valley 10K Unaffilitated £22.00 (GBP)*  

Price does not include booking fee



We actively welcome support and involvement from local communities, businesses and individuals. If you would like to find out more about marshalling, sponsorship or group bookings please contact us at the address below.

In order to maintain social distancing we are currently discouraging spectators from attending the event.
If you would like more info on this event please use the email address below:


Custom designed medal for all finishers!

Due to the need to ensure social distancing, there will be no prizegiving on the day. 

There will be full results on the chip timing website both overall and by category.

Course Information

A beautiful, picturesque course that is flat and fast

The race starts and finishes in the White Water Centre

Lee Valley Half marathon Route Map

Lee Valley 10k Route Map

And after completing your distance, you will be congratulated with a custom event medal. The event will also be chip timed so you will get an accurate time for your race.

Training Plans

Whether this is your first Half Marathon or 10K and want to know how to prepare, or are looking to smash your personal best – following a training plan will increase your chances of achieving your goals.

Visit the ATW Shop to submit your requirements for a fully customised training plan.

Other Race Information

It is important that you are fit to run and have not experienced any Covid-19 symptoms in the 14 days leading up to the event. If so, you must withdraw.

Race Numbers
Please wear your number pinned to the front of your vest.

Parking and Transport
Free Parking is available at Lee Valley Regional Park. There is no parking at the White Water Centre.

Changing Facilities
We will not be providing a changing area, therefore please come changed and ready to race. There will be no designated baggage area for this event as per Uk Athletics guidance.

Toilets will be provided for the event.

Time Limit
The Run Fest at Lee Valley Half Marathon and 10K have a maximum time restriction of 3 hours, after which there may not be marshals and time keepers available.

ActiveTrainingWorld do not offer transfers or deferrals for this event or any events listed on the website. If you are unable to attend due to illness, injury, family bereavement, jury service you will only be eligible for a refund on production of official evidence: Positive Covid-19 test result, Doctor’s note, Death Certificate etc.

We want you to book with confidence so, if this event can no longer go ahead, and a postponement date isn’t found, you will be offered a virtual run or a refund of your entry fee. (Booking fees are non-refundable)


By entering this event you agree to the below terms and conditions:

Your details will kept in accordance with the Active Training World Privacy Policy

Your name, date of birth and email details will be onto the chip timing company. Personal details will be deleted 1 week after the event.

Where specified on the booking form any medical information will be passed onto the medical team present at the event. 


1) I am over the age of 15 on the day of the event. 

2)  I declare that I am medically fit to compete & understand that I do so entirely at my own risk.

2) I understand that I enter the race at my own risk and that no person(s) or organisation(s) will be held responsible for any accident, injury or loss to myself, prior to, during or after the event.

3) I understand the organisers reserve the right to alter the arrangements and conditions, should circumstances require.

4) I agree that I will not use an audio device such as MP3 or ipod as it is against UKA rules.

4)  By entering this event, I accept UKA rules.