Core strength helps you reach your speed potential.
Adequate core strength helps you run fast late in the game when you are dog tired! You will generate more power when you are tired if you have core strength.
One of the first signs of fatigue that I look for in an athlete is whether he or she can remain strong and upright towards the end of the game. If your core is weak, you will start to "bend over" and lose power and explosiveness when you run. Next, your arms will start to "flail" instead of pumping powerfully to fuel your running.
Adequate core strength helps your speed endurance , which is the ability to maintain maximum velocity or a percentage of maximum velocity for a prolonged period of time or in a fatigued state. The best players and teams have excellent overall body strength, core strength and speed endurance (and they win the most games).
If you are a serious athlete, you need a program that continually challenges and improves your core strength! You will lose power and speed during the game if you have a weak core area!