Golfers need to be consistent with where the bottom of their swing contacts the ground, which is why the feedback from your divots is so important to developing a sound golf swing
This drill is great for people stuck in an office or in bad weather, hook the right hand under the left and practice your backswing and downswing with a perfect right and left wrist position
The arms work very differently in the swing, with the left arm staying straight up to the release and the right arm bending early, use this two club drill to get the feel of the proper motion of the arms working together