In a gym those exercises involve more of an upwards pull with the core and a push with your legs, with the weight very close to your center of gravity. Also you have a really good grip and the weight isn’t likely to suddenly shift or slip.
When you lift a big box or piece of furniture and youre leaning further over it, you can’t get it as close to your center of gravity so you end up pulling against your back muscles in a different way.
It’s still safe enough when you’re in control but the injuries usually happen when you’re lifting things that can shift, or slip, or the person you’re lifting with drops it, and you inevitably don’t want to drop the TV or fridge or whatever and that’s when you suddenly twist or pull harder and pop goes your back
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