Golf stroke mechanics is the means by which golfers make decisions (selecting clubs, selecting shots) and execute them (making shots) in the sport of golf. For all golfers, it consists of a pre-stroke, in which golfers choose which club they want and their stance, and the actual stroke. The stroke is a complex motion and there is still disagreement on what constitutes a "good" golf swing. In Work and Power Analysis of the Golf Swing, Nesbit and Serrano suggest the golf swing has been studied by scientists and mathematicians who have developed various equations to help explain the complexity of the swing. It is generally agreed that a successful and consistent golf swing requires precise timing and mechanics, from the grip and position of one's fingers, to the position and movement of the feet. At any moment of the swing, whether back-swing, downswing, or upswing, something can go wrong that will throw off the whole body and result in a mishit. The entire swing motion should move on a plane in a fluid manner. The plane can be characterized as horizontal or vertical.