Grim Challenge

The Summer Nuts Challenge is a premier mud obstacle race held near London in Dorking, Surrey. This event features a permanent 7km assault course with over 100 natural and man-made obstacles, including mud trenches, water obstacles, rope climbs, walls, cargo nets, and tunnels. Suitable for all fitness levels, participants can run solo, in teams, or for charity, with options to choose between 7K or 14K distances or multiple laps. Known as the UK's oldest and most established obstacle course race, it offers a challenging and fun experience in a beautiful countryside setting, emphasizing endurance, strength, and teamwork. Visit the organization's website for the most recent information.

The London South East Spartan Trifecta Weekend takes place at Pippingford Park, East Sussex, known for its rolling hills, scenic countryside, and challenging terrain. The event features multiple race distances: Sprint (5K, 20 obstacles), Super (10K, 25 obstacles), Beast (21K, 30 obstacles), and Ultra (50K, 60 obstacles), alongside kids' races and a 12-hour Hurricane Heat challenge. Participants face classic Spartan obstacles like the Atlas Carry, Rope Climb, Spear Throw, and Fire Jump, often in wet and muddy conditions. The weekend offers a vibrant festival atmosphere with music and celebrations, making it a demanding yet rewarding experience for obstacle course racers of all levels. Visit the organization's website for the most recent information.

The Brighton Fun Inflatable 5K Obstacle Course, held at Stanmer Park, East Sussex, is the world's largest inflatable obstacle run, featuring a 2.5 km course with 30 giant inflatable obstacles on the 5K distance. Participants can choose from distances of 2.5K, 5K, 10K, or 15K, with obstacles repeated each lap. The event offers a lively atmosphere with five music zones to energize runners as they jump, slide, and bounce through challenges like the Start Mountain, The Crawler, and The Vortex. Suitable for all ages, it encourages family participation and group discounts, making it a fun, active day out in Brighton. Visit the organization's website for the most recent information.

The Windsor Fun Inflatable 5K Obstacle Course, held at Windsor Racecourse in Berkshire, is the world's largest inflatable obstacle run, featuring a 2.5 km course with 30 giant, bouncy obstacles for the 5K distance. Participants can also choose from 2.5K, 10K, or 15K distances, with obstacles scaling accordingly. The event offers a lively atmosphere with five music zones to energize runners as they jump, slide, and swing through challenges like the Start Mountain, The Crawler, and The Vortex. Suitable for all ages, it encourages family participation and group discounts, making it a fun, active day out for friends and families alike. Visit the organization's website for the most recent information.

The The Hybrid Games- London will take place in London on Saturday 22 November 2025.

The London West Spartan Trifecta Weekend takes place in Henley on Thames, UK, featuring a challenging obstacle course race across historic landmarks and a scenic riverside course. The event spans two days and offers multiple race distances: the Sprint (5K with 20 obstacles), Super (10K with 25 obstacles), and Beast (21K with 30 obstacles), plus a kids' race. Participants face classic Spartan obstacles such as the Atlas Carry, A-Frame Cargo Climb, Barbed Wire Crawl, Fire Jump, and Spear Throw. The event combines physical endurance with teamwork and offers a vibrant festival atmosphere with music and celebrations, making it a memorable test of strength and grit. Visit the organization's website for the most recent information.