Nuclear Rush Weekend 6K & 12K Sunday 2026

Nuclear Fit May is a 6K outdoor fitness race held at Kelvedon Hatch, near Brentwood in Essex, starting early in May. The 6K distance is divided into six 1K trail sections, each followed by high-intensity workout stations, creating a full-body challenge of running, strength, and stamina. The course combines short trail runs with functional fitness exercises like sled pulls and tyre flips. It is designed for individuals seeking a race that emphasizes gym-style effort alongside pace. A Storm format is available for participants who prefer the workout stations without the running component. Additionally, a relay option is offered, allowing teams to engage in the same format.