Define the difference between Core and Abdominal training?
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There is no separation between these two. The real issue is that previous science has updated to see that the old school crunch (or worse sit up) is not that effective to train the core. This is because it has been found that the rectus abdominis is not as important to stability as previously thought. But now we know that all of the spinal stabilizers need to be trained and that the rectus abdominis is a minor player in that arena.