It should be noted that although these movements are named, due to the infinite possibilities of an environment, there is an infinite variation in the number of movements which can be applied as different situations will require adaption. Another important factor is that because parkour emphasizes efficiency, although several movements may be used to cross an obstacle, the fastest is considered to be the "best" parkour. Just as a martial artist may not pick the most suited movement in the heat of the moment, a practitioner of parkour may use a less efficient movement while missing a potentially more efficient option, be it because of lack of experience or a misjudgment of the obstacle to be overcome. Nonetheless, the ultimate goal of parkour is to minimize these misjudgements and be as efficient as possible as often as possible. On-the-spot judgment thus becomes an important part of the practice.
Many traceurs, including a large majority of veterans and those who learn from them, have foregone certain movements in training. Specifically, most traceurs do not practice drops higher than 6 feet or any rooftop jumping. This is to better preserve the body and the image of Parkour, so that spreading the art becomes easier to do. It has also become somewhat of a debate as to whether or not drops should be considered a "move" at all. It should be noted that some traceurs still practice drops and rooftops.