Basically you are abusing your system by doing dead lift which is not recommended but if you have to do it I think you need to have your body which is the flexible, your back muscle which are really strong more than upper limbs and chest. As most of the gym instructor would concentrate on building up your chest muscles the pectorals upper limb muscles like biceps, triceps but not give so much importance to your back and neck if you really want to avoid injuring your back I think you need to concentrate on doing flexibility exercises stretches before doing all this aggressive and strenuous activities like headed lift, so I would recommend more than building the bulk of the muscles, I think it has to do with the building of flexibility in your back and neck so that you don't break.
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