In a deadlift you still “lift with your legs”. If your back is rounding excessively, you are probably doing it wrong.
Although there is an exercise called the “Jefferson Curl” which you should look up. It invokes only lifting with your back. If you approach it carefully and gradually build up, you will have a strong and injury resistant back.
Certain movements and motions should not be inherently bound to injure the human body.
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