By eHow Sports & Fitness Editor
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The oblique muscles in the abdomen are those on the sides of the upper and lower abdominal muscles. You need to strengthen these muscles in order to have a strong over-all core. There are many exercises that can help work the oblique muscles, but using a physio ball, an inflatable exercise ball, can give you better results with a wider range of motion in each rep.
eHow Sports & Fitness Editor