Final answer:
When the feet turn out during an overhead squat assessment, it indicates an external rotation of the hip. The overactive muscles responsible for this movement include the tensor fasciae latae (TFL) and the gluteus medius.
Step-by-step explanation:
When the feet turn out during an overhead squat assessment, it indicates an external rotation of the hip. This can be caused by overactive muscles in the lower extremities, specifically the lateral hip muscles such as the tensor fasciae latae (TFL) and the gluteus medius. These muscles play a role in controlling hip and knee alignment during movement.