Skills are most effective when they are executed with as much power as possible. Some skills require a higher degree of speed, while other skills require a higher level of strength. Both speed and strength should be developed to the highest degree possible. Endurance is the ability to sustain maximum power on each play for the entire game. Coaches become concerned with the athlete's endurance levels and sometimes the wrong approach is taken.
Some coaches require their athletes to run long distances to build stamina.
Power sports are played in short intervals of high intense activity and with rest interval between. How well you play in a game depends on how well you practice. The game is simply executing what you have practiced during the week. Imagine never practicing and just showing up and playing in a game. The chances of winning would be pretty slim.