In order to hit a solid two-handed backhand the racquet head needs to work correctly. This drill will help you understand the meaning of hitting through the shot and will help you smoothen your swing path.
The correct use of the non-dominant arm is the key to a great two-handed backhand. Many technical deficiencies on this stroke are the result of poor utilization of this arm. Ideally, the non-dominant arm on a two-handed backhand should mirror a forehand.