Essex's leading races

Step away from the everyday and take on Nuclear Races, Nuclear Fit and Nuclear Mud Tribe: three proven ways to challenge yourself and come away with a genuine sense of achievement. From Nuclear Races’ award-winning obstacle races and Nuclear Fit’s tough mix of trail runs and functional fitness stations, through to Nuclear Mud Tribe’s fun and friendly obstacle courses, each brand has earned its reputation for delivering a solid sense of accomplishment, backed by our award-winning customer service.

Step out of the routine and into the thrill of award-winning obstacle course action at Nuclear Races.

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Challenge yourself with Nuclear Fit, an outdoor fitness race that tests your strength, stamina, and determination.

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Get muddy with Mud Tribe, a 5k obstacle course run which is suitable for all abilities.

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Gift Vouchers

Give the gift of memories. A Nuclear Essex Gift Voucher is the perfect way to treat someone special to an unforgettable experience, from family days out to celebrations or action-packed adventures with friends.

Vouchers can be used across all Nuclear Essex activities, including thrilling zip trekking at Nuclear Adventures, muddy challenges at Nuclear Races, fitness events at Nuclear Fit, immersive visits to the iconic Secret Nuclear Bunker, parties, group experiences and more.

Whatever they love, there’s an adventure waiting.

Discover The Nuclear Essex Site

What's On

Rush

9th May / 10th May

4+

All Abilities

Various Distances

Mud Tribe

Saturday 5 September 2026

4+

Easy

5km

Nuclear Fit – May 2026

Sunday 10 May 2026

Adult / 16+

All Abilities

Secret Nuclear Bunker Tour

All Ages

Allow 1 Hour

High Ropes

Take on a high ropes adventure at our challenging course where you’ll navigate thrilling obstacles and zip lines high in the air!

6+

All Abilities

Approx. 2 hours

Obstacle Taster

Booking required

6+

All Abilities

Bobble Hat Run

Beat the post-Christmas cabin fever with our 2k woodland obstacle run. Relaxed, fun, festive vibes guaranteed!

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High Ropes Illuminated

Experience our Nuclear High Ropes course like never before in this after dark illuminated special!

Summer Holiday

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Nuclear Offers

Nuclear Fit group offers!

We’re inviting gyms, bootcamps, corporate teams and fitness communities across the country to partner...

15% Off Hotel accommodation on May race weekend

Gearing up for the UK’s most award-winning obstacle course? Don’t let the challenge end at the finish...

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

Saturday race the 6K obstacle course, and Sunday compete in Nuclear Fit Storm for a discounted price...

EARN THE TREBLE FIT MEDAL: Complete All Three Nuclear Fit Events

Three events. One elite medal. Consistency never looked so good.

15% OFF: Multi-Activity Discount at Nuclear Adventures

Double the challenge, less of the cost! Book 2 or more activities at Nuclear Adventures and automatically...

EARN THE MIGHTY MUDALLION: Complete the Ultimate Nuclear Challenge

Prove your commitment: Complete three totally different qualifying Nuclear Races events in one year to...

The ROOKIE MUDALLION: Earn a HUGE Blinging Medal!

Enter BOTH of our award-winning kids' obstacle courses in 2025 and earn the free, absolutely HUGE, blinging...

DryRobe Upgrade: Get a FREE Event Ticket

Purchase a co-branded Nuclear DryRobe at checkout and get a FREE entry for an eligible Nuclear Race,...

FREE WILD FOREST INDUCTION with Your Nuclear Race Ticket

Got a Nuclear Race ticket? Get ONE FREE Wild Forest obstacle course induction to learn tips, master safety,...

10% OFF Group Tasters: Conquer the Nuclear Wild Forest

Gather your crew! Groups of 6 or more get 10% OFF the 2km & 3km Obstacle Taster sessions at Nuclear...