British Military Fitness offers hour-long high intensity workouts led by trainers with military backgrounds, focusing on exercises like burpees, sit-ups, and squats to improve fitness over weekly classes for £5.40 per class plus membership. Judgement Day hosts military-style obstacle course races in challenging environments to build all-round fitness, with 6k or 12k events in Hampshire or weekend-long races in East Sussex for £35. Commando Series offers 6km obstacle course races for families with children 8+ where participants choose difficulty levels, based on Royal Marines training, across the UK for £55 for adults and £30 for children.