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@manuelm Maybe just an alternative progression, or complementary to, as opposed to a valid replacement. It seems that the extension progression is a bit more dynamic.

@maymcflurry I think you're totally right in saying that it's an apples to oranges comparison. It seems that Jeff is merely debunking some misconceptions of a very popular exercise.

Longtime lurker here. I recently watched this regarding planks. It's an interesting perspective that appears to make some valid points on the limitations of this frequently lauded exercise. First, Jeff Cavaliere notes that it only works the abs in one plane, the sagittal plane, as opposed to...