Which of the following helps promote agility?

Narrowing the base of support is a key factor in promoting agility because it allows for greater movement flexibility and quicker response times. When the base of support is narrower, the body can shift its weight more easily, facilitating rapid changes in direction and speed. This is essential for activities that require quick footwork or evasive maneuvers, such as in many sports where agility is critical for performance.

A wider base of support tends to stabilize the body more but can limit agility because it requires more movement effort to change directions. Lowering the center of gravity can enhance stability but does not necessarily promote agility; agility relies more on the ability to respond quickly rather than on a lowered center. Increasing friction can provide better grip, but too much friction can actually hinder quick movements by making it more difficult to change directions rapidly. Thus, narrowing the base of support is directly aligned with improving agility.