What aspect of the Fourth Intermediate Aerial Position is key to its definition?

The Fourth Intermediate Aerial Position in Scottish Highland Dance is characterized by the placement of the working leg (WL) being raised to either a normal or a low height. This elevation is essential to the definition of this position because it embodies the athleticism and grace that are hallmarks of Highland dancing. The working leg's position is crucial for the dancer's balance and control during movements, contributing to the aesthetic quality of the dance. When the WL is at the appropriate height, it allows for the necessary posture and alignment that supports the overall structure of the dance, making it an integral part of this particular position.

In contrast, having both feet flat on the ground, requiring no foot elevation, or needing the WL to be relaxed would not align with the defining characteristics of the Fourth Intermediate Aerial Position. These attributes would compromise the energy and dynamism that this position is meant to convey, underscoring the importance of the specific height of the working leg in defining this aerial position.