All top recurve archers are extremely stable and do not have much sway in their posture when they shoot, this drill helps you eliminate sway too. An important part of eliminating sway is to have correct posture and positioning in the first place. To read more about the technical side of posture, see our Recurve Archery Technique – Stance & Posture section.
To read about core exercises that you can do as part of your gym sessions, see our Recurve Archery Exercises section. These exercises can really help your archery posture.