What term describes the ability to move quickly and easily?

The term that describes the ability to move quickly and easily is agility. Agility refers to the capacity to change direction rapidly and effectively, showcasing both speed and coordination. This is particularly important in various athletic performances where quick changes in movement or evasive actions are required, such as in sports like basketball or soccer.

Agility involves complex motor skills and is influenced by balance, strength, and flexibility, allowing individuals to perform movements with precision. This term encompasses not only the speed of movement but also the skillful and controlled nature of those movements, which is essential for effective performance in dynamic environments.

Endurance relates to the ability to sustain physical activity over time, power refers to the ability to exert force rapidly, and balance describes the ability to maintain the body's center of mass over its base of support. While each of these attributes is important in physical fitness, agility specifically focuses on the quick and easy movement and change of direction, making it the correct answer in this context.