A common problem for amateurs is an inability to match up their body turn with their arms through the golf ball. Taking your normal setup posture, grip down on the club so that the butt of the club touches your belly.
From there, make a normal backswing. As you come down, get the club back into the belly and rotate in full. This will help you understand how to sequence or to match up through the golf ball. Similarly, if you struggle with flipping your hands through impact, do the same drill, except put the butt of the club off your lead hip.
