Final answer:
Balance is tested when a gymnast walks on the beam. Agility and coordination are skills also essential in gymnastics.
Explanation:
Balance is the type of skill tested when a gymnast gracefully walks across a four-inch beam that is three feet in the air. Balance is the ability to maintain equilibrium while stationary or moving.
Agility is the ability to move quickly and change direction with ease, and it might be tested in activities that require rapid movement and coordination.
Coordination involves the ability to integrate multiple movements smoothly, like in gymnastics routines which combine various body movements.
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