If we are taught to never lift with our backs, why are there popular exercises like Romanian deadlifts and good mornings which has you specifically lifting with your back?
In: Biology
You are taught not to lift with your low back in a disadvantaged position that is high risk for disc herniation. When fully flexed in the lumbar spine, your lumbar discs are at the most vulnerable position they can be. Loading that with heavy weight is asking for injury. RDL and good mornings are designed to be done with a neutral lumbar spine, and you lift by engaging your entire posterior chain (all your erector spinae, glutes, hams, etc) not just your low back.
“Don’t lift with your back” is just a very shortened cue to remind people not to bend over and jerk up a bunch of weight with terrible form.
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