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Most runners know that strong core muscles are as important as strong quads, calves, and hamstrings.
But how do you build a stronger core? To truly strengthen your core muscles, add an element of rotation. There's no reason to give up your favorite form of crunches, but add a twist.
For example, when doing crunches on a fitness ball, rotate as you come up, raising your left elbow and shoulder and turning slightly to the right. Repeat 10 times, or alternate right and left for a total of 20 reps.