You can strengthen them for sure but the amount you can lift using your legs is way more than your back. Most people use a mixture of both and sometimes they’ll use just their legs. But if you were to try lifting the same amount you normally could with your legs but with only your back you WILL mess up your back. Your body will immediately contort to force your legs to get involved but if you were stubborn… bad news bears.
That’s why the safest way to do this is to just use all legs since the difference is large enough to cause injury if you’re not paying attention.
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