I don't think there's anything wrong with round-back lifting if you don't have existing injuries and you're conservative going into it. Round-back straight (or stiff) legged deadlifts standing on a block/bench to allow full range of motion are great, as are back extensions (ie. actual back extensions, not hip extensions). As long as you're maintaining adequate hip mobility and also strengthening the back isometrically, I think these can be good supplemental exercises. And if you notice any pain or problem, you can stop doing them.
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