the jump depends on converting all the angular momentum into rotational momentum. Mastering the flying spin takes less time and practice if skaters have already mastered basic spin techniques and good jumping ability. Combination spins are required in the programs of all disciplines. Flying spins and basic spins can be combined in any number of variations. The maintenance, or acceleration, of the rotational momentum created on the entrance of the first spin is the most important principle governing the execution of combination spins, which require quick movements during the spins' transitions. When a change of feet is required to successfully perform combination spins, the center of rotation of subsequent spins should be as close as possible to the center of rotation of the first spin of the combination. Combination spins must include more than one position and may or may not involve a change of foot. Rules and regulations Single skating If a skater performs a spin that has no basic position with only two revolutions, or with less than two revolutions, they do not fulfill the position requirement for the spin, and receives no points for it. A spin with less than three revolutions is not considered a spin; rather, it is considered a skating movement. The flying spin and any spin that only has one position must have six revolutions; spin combinations must have 10 revolutions. Required revolutions are counted from when the skater enters the spin until they exit out of it, except for flying spins and the spins in which the final wind-up is in one position. Skaters increase the difficulty of camel spins by grabbing their leg or blade while performing the spin. A skater earns points for a spin change of edge only if they complete the spin in a basic position. Fluctuations in speed and variations in the positions of a skater's arms, head, and free leg are permitted. A skater must execute at least three revolutions before and after a change of foot. If a skater tries to perform a spin and his or her change of foot is too far apart (thus creating two spins instead of one), only the part executed before the change of foot is included in the skater's score. The change of foot is optional for spin combinations and for single-position spins. If they fall while entering a spin, the skater can fill the time lost by