And no, the exercise isn't a side crunch. I think it is a pilates inspired thing. It is a very small movement, but takes some effort. The shoulder and the pelvis both remain on the floor, but you pull them together a little with your core muscles all tense, so that this gap forms instead of your middle just sagging onto the floor. That is, the hip and shoulder that are resting on the floor move closer together, while you are on that side, not the upper ones.
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And no, the exercise isn't a side crunch. I think it is a pilates inspired thing. It is a very small movement, but takes some effort. The shoulder and the pelvis both remain on the floor, but you pull them together a little with your core muscles all tense, so that this gap forms instead of your middle just sagging onto the floor. That is, the hip and shoulder that are resting on the floor move closer together, while you are on that side, not the upper ones.