Final answer:
The 4-letter word describing body configuration is 'pose,' which is influenced by natural physique and specific stances like 'contrapposto'. Good posture is maintaining the body's center of gravity above the hips.
Step-by-step explanation:
The 4-letter word referring to the configuration of the body resting or in motion, where a good one is partly natural physique, is pose. A pose emphasizes the structure and grace of the body, which can be influenced by natural physique but also by the position or stance the body is in. For instance, the contrapposto stance, a significant pose in art history, shows a figure bearing weight on one leg, naturally shifting the hips, chest, and shoulders to create a more realistic posture. Similarly, someone with good posture maintains their body's center of gravity above the hips, which helps to avoid back strain. Having a good pose is critical whether the body is in motion, such as during a pirouette, or at rest in a supine or prone position.