Technically, a golfer would like their arms to rotate in the backswing, downswing and follow through. Why is rotation so important? Well, it helps the clubface stay square during the swing and maintains the clubhead speed through the hitting area.
All you require for the exercise is something round (a soccer ball or a big cushion) between your hands, take up your standard address position and get into the positions shown in the pictures. You do not have to swing further than waist height in the backswing or the follow through.
Important to note that you would be able to shake hands with someone at waist height in the backswing and the follow through.


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Golf tip courtesy of KeNako Golf and Sport Academy.