Make the most of all we have to offer, experience multiple activities on the same day

Illuminated

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Bobble Hat Run

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Training

Nuclear Fit – May 2026

Nuclear Fit is a 6km endurance event where you alternate...

Mud Tribe

Gather your tribe! Join the fun at Mud Tribe, a...

Secret Nuclear Bunker Tour

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Rush

Prepare for the ultimate muddy obstacle course race at Nuclear...

The ultimate fitness weekend: Nuclear Rush & Nuclear Fit Storm!

Fit, Races

Two Days. Two Challenges. One Epic Weekend.

Ready to take your weekend to the next level? Double the fun with our Nuclear Rush + Nuclear Fit Storm combo offer — the ultimate two days of fitness at Nuclear Essex.

On Saturday, take on the legendary Nuclear Rush 6km obstacle course packed with mud, water, and obstacles that’ll have you climbing, crawling, swinging, and laughing all the way to the finish line.

Please note: This offer is valid for the 6km course only and does not apply to the 12km.

Then on Sunday, switch gears and take on Nuclear Fit Storm — our high-energy outdoor fitness competition featuring six unique functional fitness stations designed to test strength, endurance, and determination. It’s an unbeatable way to see what you’re capable of.

Your weekend just got even better:

  • Free overnight camping with basic amenities

  • Two epic races & two finisher medals

  • All for just £99.00
    (Offer valid for individual racers only. Not available for teams or doubles entries.)

By booking both events together, you’ll unlock a discounted combo price — perfect for anyone who loves a challenge and isn’t afraid to get a little muddy (or a lot!).

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Find us

How to find us

Nuclear Essex is located in Brentwood, Essex just 15 minutes from the A12, M25 and M11.

By Train and taxi, we’re just 15 minutes from Brentwood station (on the mainline from Liverpool St) or 15 minutes from Epping Underground station.

By Train and taxi, we’re just 15 minutes from Brentwood station (on the mainline from Liverpool St) or 15 minutes from Epping Underground station.