In this Porzak Golf tutorial, the instructor demonstrates the Headcover Drill to help golfers maintain arm-body connection. He explains that golfers often drop the headcover because their body rotation stalls, forcing the arms to move independently to reach the top of the swing.
Clamp a headcover under your arm at address and hold it there until the top of the backswing.
A common cause of losing the headcover is failing to complete the shoulder turn.
If the body 'locks' or stops rotating, the arms tend to disconnect and fly away from the torso.
A full turn allows the arms to stay connected naturally without feeling forced.