To improve his golf swing, a player needs to follow a correct training regime as well as understand the concept of inertia. As per the definition in physics, the moment of inertia (MOI) is the tendency of an object to remain in its original state (either at rest or in motion), until and unless an external force is applied on the object. The principle of MOI can be applied to the golf swing as well. During the backswing, the speed is zero (at the top), and in the downswing, a force is applied on the club to set it in motion. Reducing the MOI during downswing is the key to achieve greater swing speed.
In the beginning, the golfer readies to take the shot by swinging the golf club behind his body. This force is known as the backswing. At the highest point of the swing arc, for a split-second, the club becomes stationary. Eventually, the golfer uses some force to his swing, which sets the club into motion. The club will continue to be in a swinging motion, unless another force is applied to stop it. This can be achieved if a force is applied in the opposite direction, that will stop the golf club after it has hit the ball. The faster the swing speed, the longer is the distance traveled by the ball. In simpler terms, the quicker a player can accelerate from the backswing to the downswing, the more will be the swing speed.
In the backswing and downswing, both inertia and force are responsible for regulating the direction and speed of the club. The golfer tries to maintain balance, which is important to overcome the inertia. While retaining balance, the body uses the natural tendency and distributes the weight to overcome the MOI. Thus, in the downswing, the exerted force stops the club, and pushes it in the opposite direction.
If a player understands the natural tendency of the body, and, then he/she will find it very easy to achieve and maintain a proper golf swing consistently. Overcome the inertia by practicing step training regularly, which is performed by swinging the club to the top, and at the same time, stepping one step forward. This way, the force exerted on the club can be balanced between the backswing and the downswing, which in turn, will help the club to accelerate faster.
Another tip to increase the swing speed is to keep the downswing radius as small as possible, along with the correct grip (fully cocked position), before striking the ball. The closer the arms are to the body, the more force the swing will generate. Other basic tips for lowering inertia include a proper grip, balanced distribution of weight from backswing to downswing, and proper follow-through.