goal for most spins is to rotate as quickly as possible, to have a well-defined and pleasing body position, to maintain perfect balance before, during, and after the spin, and to remain in one place, called centering, while executing a spin. A good spin should rotate in one place on the ice, "drawing a series of tiny overlapping circles on top of each other" into the ice. A skater who executes a spin that is not centered will travel across the ice, "producing a series of loops strung out along a curve or straight line, so that the skater will end the spin several feet away from the spot on the ice where she began it". In order to rotate rapidly, the skater must increase their speed (rotations per minute), which is accomplished by reducing the distance of the vertical axis from the parts of their body. This is done by bringing their arms and free leg closer to their body, in line with the vertical axis. Since the true center of gravity is at the point in which the blade meets the ice, the skater must also lower their arms and free leg toward that point. The force created by the spin is generated outward and upward, or via the path of least resistance, as their speed increases. When skaters allow the force to follow the path of least resistance, however, they will lose some of the force that contributes to rotational speed, so when they increase a spin's speed, they must move their arms and free leg inward and downward. Exactly how this is done varies depending on the type of spin skaters perform. Skaters experience dizziness during spins because as they spin, their eyes focus on an immobile object and follows it until the object passes beyond their peripheral vision. Then their eyes race ahead to focus on a new object and as the spin ends, their eyes continue to follow this pattern, causing dizziness. It takes practice to train the eyes to return to normal, which dissipates the experience of dizziness. Types/positions of spins There are two types of spins, the forward spin and the backward spin. The forward spin is executed on the back inside edge of the skate and is entered into by the forward outside edge and 3 turn; the equivalent movement is ballet in the pirouette en dedans. The backward spin, which