Which movement is described by "forward/backward advanced elongation of walking combined with coordination"?

The movement described as "forward/backward advanced elongation of walking combined with coordination" aligns closely with the concept of sliding. In sliding, one leg moves laterally while the other leg follows, maintaining a horizontal motion that emphasizes balance and coordination. This technique allows for practice in smooth transitions and controlled movements, which is essential in various physical activities.

Sliding is characterized by the ability to alternate between sides, extending the body and maintaining a low center of gravity, which can appear similar to walking but emphasizes the lateral aspect and sophistication of movement. This makes sliding unique, as it represents a blend of coordination and stability, enabling the performer to navigate spaces efficiently.

In contrast, options like climbing involve vertical movement with different mechanics, leaping includes upward propulsion that doesn't emphasize rhythmic coordination in the same way, and galloping is characterized by a distinct forward motion rather than the specific elongation mentioned. Therefore, sliding is the only choice that captures the described movement effectively.