What term refers to the ability to change the body's position quickly and easily?

The term that refers to the ability to change the body's position quickly and easily is agility. Agility encompasses a combination of speed, balance, coordination, and reaction time, which allows an individual to change direction rapidly without losing speed or control. This skill is particularly important in various sports and physical activities where quick movements are necessary to evade opponents or respond to changing circumstances on the field.

Balance refers to maintaining a stable position either while standing still or moving, while coordination involves the integration of different parts of the body to perform smooth and controlled movements. Stability is related to maintaining a position without excessive movement or wobbling, focusing more on the base of support and control of body segments rather than the speed of movement. Though all these terms are related to physical performance, agility specifically highlights the swift and efficient changes in position, making it the correct choice.