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It’s never okay to locally extend/flex your spine. I’m not familiar with Cobra either, and can’t tell if there’s a bit of a local extension at the lumbar. That being said, you’re not loaded, so this stuff isn’t going to be too sketchy in reality. I think it’s safe to keep your abs and butt on 20% here, as always. Kelly’s organization principles should be applied to every movement we undertake. This is why I’m not always a fan of yoga (and from I understand, neither is Kelly)—because it can indeed put us in compromised positions for the sake of yoga.