Anaerobic fitness accounts for your ability to recover quicker and consistently sprint at high speed. This is especially useful in soccer because you may have to perform at your highest pace during any given moment in the course of a match.

Fartlek
                       

Drill: Sprint from points 1 to 6 and then back to 1. Rest at each point the given amount of time. You can alter the values in the diagram, but it must be done proportionally. Repeat 5 to 10 times.
Benefits: Fartlek drills, such as this one, are designed to get you fit quickly. Depending on the number of repetitions you complete, you will notice improvements in both your anaerobic as well as aerobic endurance. If you want to emphasize on the latter, shorten the resting time between reps

Alternating jogging and sprinting

Drill: Run on the given course altering between top speed sprinting and slow jogging. One complete circle counts as a single repetition. Adjust the distance between points accordingly and repeat 3 to 15 times depending on the course length.
Benefits: This drill improves glycogen burning, lactate tolerance and removal