Progressing on from the Lateral Hang, the Crunch version of the exercise increases the demand due to its isotonic (moving through range) nature. The lengthening phase (lowering) needs to be controlled, eccentrically loading the lateral core muscles on your top side. Controlling the transition between lowering and lifting phases will put maximal load into the obliques rather than the fascia which occurs when this part of the exercise is completely quickly.
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