Which assessment tests candidates' physical endurance for the Royal Marines?

The 3-mile run is a key assessment for testing candidates' physical endurance for the Royal Marines due to its direct correlation with the cardiovascular fitness and stamina required for military operations. This run evaluates not only the candidate's speed and performance over a sustained distance but also their ability to maintain a high effort level and recover afterward, which are critical attributes for a Royal Marine.

While other activities like the low rope course, obstacle course, and long-distance cycling may assess different aspects of physical fitness, such as agility, strength, team coordination, or specific endurance, they do not exclusively measure endurance in the same straightforward manner as the 3-mile run. The run focuses on aerobic capacity, which is essential for overall performance in combat or operational scenarios where prolonged physical activity is required. Therefore, it stands out as the definitive test in assessing the endurance capabilities of candidates aiming to join the Royal Marines.