The Gymnasium at Holy Cross College in Gampaha is likely to be a key facility for students, providing space for physical education, sports activities, and fitness training. Schools often use their gymnasiums to support a wide range of activities, including:

Physical Education Classes: For structured PE lessons where students learn various sports and fitness exercises.

Sports Practice: Space for training in school sports teams such as basketball, volleyball, and badminton.

Extracurricular Activities: Opportunities for students to engage in fitness-related clubs or activities.

Events and Competitions: Hosting intra-school or inter-school sports events and competitions