Muscular endurance gives football players the power that they need to explode and move quickly. As part of this, they activate the fast-twitch fibers in their muscles, which provides their speed.
To build the type of muscular endurance necessary for football players, they must practice sprints. Jump rope exercises also help to build endurance. Both of these exercises provide the intensity and challenge necessary to recruit fast-twitch fibers and build their strength.
On the contrary, running long distances does nothing to build the type of endurance necessary for football players. This builds endurance fitness, but only among the slow-twitch fibers in the muscles, which don't support the power necessary for football players.