I’m old school on this point and am not anything close to a power lifter. Therefore, I speak for the average Joe in the weight room who is looking to improve quality of life. If the weight is too much for you to lift without compromising your back than you shouldn’t lift it. Strengthen the muscles that support your core and try a manageable weight. A weight belt kicks in to support the muscles in the back just like a cast supports an injured region. I work with a clientele that needs those muscles to engage on their own and not rely on an external apparatus to move a load.