Great question — answering as the UphillTech team:
Here's a video that really outlines a lot of the exercises that will help. I have done some of them myself to condition for being a keeper. These all should be of great help to gaining core strength. http://www.youtube.com/watch?v=5ZZMcIo6-A8 For some more specifics, here are some of the ones that I trained with and found to be most beneficial: Lie on your back with your legs straight. Use both hands to hold a medicine ball above your head and barely off the floor. Simultaneously raise your torso and bend your right knee toward your chest as you bring the ball over your knee and toward your foot. Reverse the movement and repeat, this time bending your left knee. Do a normal crunch, but hold...
Full answer by Seplo: https://sports.stackexchange.com/a/3785 (CC BY-SA 3.0).
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