LONDON EAST, 6TH SEPTEMBER 2025, SECRET NUCLEAR BUNKER, BRENTWOOD, ESSEX
Award Winning Obstacles
Voted Best Value Event
LONDON EAST, 6TH SEPTEMBER 2025, SECRET NUCLEAR BUNKER, BRENTWOOD, ESSEX
A fun and empowering race for women to come together, support one another, and conquer the course no matter your experience or fitness level.
Age 7+
Under 14’s must be accompanied by an adult
Join us for a fun and relaxed 5K run designed to be an empowering race for women to come together, support one another, and conquer the course, no matter your experience or fitness level. Comfortable, safe, and inclusive for all women! This isn’t your typical race—it’s all about enjoying yourself in a welcoming, stress-free environment. To keep things laid-back, we won’t have any chip timing or an official start. Instead, you can begin your run anytime within a selected time slot. The Mud Sisters event start times are between 9:30 AM and 11:30 AM. Simply arrive, warm up at your own pace, and join the fun whenever you’re ready within your selected slot.
The 5K route features 17 approachable obstacles, which are completely optional, so you can choose whether or not to take them on. And don’t worry—there’s no full water submersion involved! You’re free to run, jog, or walk the distance, making this event perfect for all fitness levels. Feel free to see how many laps you can complete, or just stick to one and take it easy. The choice is yours!
We welcome participants of all abilities, and children aged 7 – 14 years can also join the run, as long as they’re accompanied by an adult. This makes it a great family activity if you want to bring your little ones along for the fun. At the end of the course, you’ll get a refreshing wash-down and receive two free pictures to commemorate your experience.
Whether you’re pushing your personal limits or just out for a casual, friendly run, we can’t wait to see you there. Let’s make it a day filled with smiles, encouragement, and lots of fun!
A race designed for men of all fitness levels to push their limits, bond with friends, and enjoy the thrill of the challenge in a comfortable and supportive environment.
Age 7+
Under 14’s must be accompanied by an adult
Join us for an event designed for men of all fitness levels to push their limits, bond with friends, and enjoy the thrill of the challenge in a comfortable and supportive environment. A fun and relaxed 5K run designed to be comfortable, safe, and inclusive for all men! This isn’t your typical race—it’s all about enjoying yourself in a welcoming, stress-free environment. To keep things laid-back, we won’t have any chip timing or an official start. Instead, you can begin your run anytime within a selected time slot. The Mud Misters event start times are between 12:30 PM and 2:30 PM. Simply arrive, warm up at your own pace, and join the fun whenever you’re ready within your selected slot.
The 5K route features 17 approachable obstacles, which are completely optional, so you can choose whether or not to take them on. And don’t worry—there’s no full water submersion involved! You’re free to run, jog, or walk the distance, making this event perfect for all fitness levels. Feel free to see how many laps you can complete, or just stick to one and take it easy. The choice is yours!
We welcome participants of all abilities, and children aged 7 – 14 years can also join the run, as long as they’re accompanied by an adult. This makes it a great family activity if you want to bring your little ones along for the fun. At the end of the course, you’ll get a refreshing wash-down and receive two free pictures to commemorate your experience.
Whether you’re pushing your personal limits or just out for a casual, friendly run, we can’t wait to see you there. Let’s make it a day filled with smiles, encouragement, and lots of fun!
Want to run in a mixed wave but prefer running with just adults? Join the Mud Tribe wave, the equivalent of our previous Blast event. Tackle the course, overcome obstacles and have fun. Includes an optional, additional 1KM for those wanting to take on a little more and experience some of our more challenging obstacles.
Age 7+
Under 14’s must be accompanied by an adult
Join us for a fun and relaxed and easy 5K run designed to be comfortable, safe, and inclusive for everyone! The Mud Tribe wave also has an optional, additional 1KM section for those wanting to challenge themselves a little more on some of our obstacles that were staples of the old Blast course.
Grab your friends, family, or coworkers and tackle the course as a team! Whether you’re a group of friends, a family unit, or an office crew, this event is all about teamwork and having a blast together. This isn’t your typical race—it’s all about enjoying yourself in a welcoming, stress-free environment. To keep things laid-back, we won’t have any chip timing or an official start. Instead, you can begin your run anytime within a selected time slot. The Mud Tribe event start times are between 3:00 PM and 4:00 PM. Simply arrive, warm up at your own pace, and join the fun whenever you’re ready within your selected slot.
The 5K route features 17 approachable obstacles, which are completely optional, so you can choose whether or not to take them on. We also include a brand new 1KM exhilarating obstacle section, designed specifically for group fun. And don’t worry—there’s no full water submersion involved! You’re free to run, jog, or walk the distance, making this event perfect for all fitness levels. Feel free to see how many laps you can complete, or just stick to one and take it easy. The choice is yours!
We welcome participants of all abilities. At the end of the course, you’ll get a refreshing wash-down and receive two free pictures to commemorate your experience.
Whether you’re pushing your personal limits or just out for a casual, friendly run, we can’t wait to see you there. Let’s make it a day filled with smiles, encouragement, and lots of fun!
Grab your friends, family, or coworkers and tackle the course as a team or you can run it on your own. Whether you’re a group of friends, a family unit, an office crew, or an individual the Mud Family race is all about teamwork and having a blast together. Bring your Tribe or join ours on the day. It’s all about your Mud Family, not your blood family. We also have a 1.5K Mud Family wave so that you can run with your younger family members.
5K Age 7+
Under 14’s must be accompanied by an adult
1.5K Age 4+
Under 14’s must be accompanied by an adult
Join us for a fun and relaxed and easy 5K run designed to be comfortable, safe, and inclusive for everyone! Grab your friends, family, or coworkers and tackle the course as a team! Whether you’re a group of friends, a family unit, or an office crew, this event is all about teamwork and having a blast together. This isn’t your typical race—it’s all about enjoying yourself in a welcoming, stress-free environment. To keep things laid-back, we won’t have any chip timing or an official start. Instead, you can begin your run anytime within a selected time slot. The Mud Family event start times are between 1:00 PM and 2:00 PM. Simply arrive, warm up at your own pace, and join the fun whenever you’re ready within your selected slot.
The 5K route features 17 approachable obstacles, which are completely optional, so you can choose whether or not to take them on. And don’t worry—there’s no full water submersion involved! You’re free to run, jog, or walk the distance, making this event perfect for all fitness levels. Feel free to see how many laps you can complete, or just stick to one and take it easy. The choice is yours!
We welcome participants of all abilities, and children aged 7 -14 years can also join the run, as long as they’re accompanied by an adult. This makes it a great family activity if you want to bring your little ones along for the fun. At the end of the course, you’ll get a refreshing wash-down and receive two free pictures to commemorate your experience.
Whether you’re pushing your personal limits or just out for a casual, friendly run, we can’t wait to see you there. Let’s make it a day filled with smiles, encouragement, and lots of fun!
We also have a 1.5K Mud Family wave so that you can run with your younger family members.
Here at Nuclear, over the past decade, it’s become apparent that there is a close association between mental health and some fo our community. We have heard many incredible and amazing stories and we want to do our bit to help with mental health.
Each year an estimated 1 in 4 people are affected by mental health problems, with the alarming statistic of 1 person taking their own life every 1.5 hours in the UK.
Andy Baines-Vosper, a valued and long-time member of the Nuclear community has shared his deeply inspiring story with us. A story of personal struggles and his own battles with mental health that has led to him launching the Share The Weight campaign; something we have found UTTERLY INSPIRATIONAL.
A bold and meaningful campaign, which Andy calls his mission, is all about asking a million people to help carry the weight on his shoulders. Not only to help him, but to crush the stigma that asking for help makes us weak or a burden. It should be an everyday part of life. By supporting his campaign, we aim to spark change, through conversation, connection and fundraising, so those struggling don’t feel alone and have a platform to seek help.
Andy played a key role in inspiring us to use this event as a platform to promote mental health awareness and fundraising.
Find out more abut Andy and Share the Weight here.
