There is lifting with your back, then there is lifting with your back.
Your lower back along with your abs support your spine. You can lift with your back, but lifting with your legs supported by your core muscles (abs and lower back) is much stronger and safer.
If you want to strengthen your lower back, RDLs and Good Mornings help isolate that muscle group, but the hamstrings are still involved; hamstrings being part of your legs. This helps train the “hip hinge” that can help make one stronger in lifting with their legs and not their back.
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