Which of the following is most likely to be affected by increased load carriage during physical activities?

Increased load carriage during physical activities primarily affects mobility. When carrying additional weight, the body's mechanics and range of motion can be impacted. Mobility refers to the ability to move freely and easily, and heavy loads can restrict this capacity by altering biomechanics and placing stress on joints and muscles.

As weight is added, individuals may experience a decreased ability to perform movements that require flexibility and fluidity. This can lead to compensatory movements or reduced efficiency in movement patterns, affecting overall mobility. Therefore, while strength, endurance, and agility can also have variations due to load, it is mobility that is most directly influenced by load carriage, as it requires a balance of strength, flexibility, and coordination to move effectively.