CJM Hampton Court held the Inter-house Marathon on 12th September, 2025. It was a vibrant display of athleticism and sportsmanship, showcasing school spirit, fitness, and wellness. The Inter-house Marathon took place in two parts. The first part of the event was for the senior school, comprising students from classes 6–12. For the boys in the senior school, the marathon routes varied based on their classes. The route for boys in classes 6 to 8 covered a stretch till Bahuguna Park on Camel's Back Road. The boys from classes 9 to 12 took on the more challenging full Camel's Back Road route. The girls from classes 6–12 had a defined course where they ran till Ambedkar Chowk and turned back to school, testing their endurance and pace. The event encouraged physical fitness, healthy competition, and a sense of accomplishment.

The teachers were present at various spots, and patrolling was also done by the teachers, ensuring the safety and security of the students throughout the event.