I want to buy a barbell but all of the reviews say its great for a upper body workout can it be used to lower too?

If I do squats and rdls with the barbell then that's a lower workout right?

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Can I build glutes and thighs with 37 pound barbell?
I want to buy a barbell but all of the reviews say its great for a upper body workout can it be used to lower too?
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