How do you “lift with your legs” when you are picking it up with your arms or hands?

Question

I would love to know and have not been able to figure this out when I am trying to lift extremely heavy objects. I always end up hurting my back or shoulders because I don’t know how you force the legs to lift things while you are standing on them in one spot or moving. Are you also supposed to be lifting with your legs while you’re walking the heavy object to its destination?

In: Physics

Answer 1

For example – to pick up a heavy box, instead of bending over 45 degrees(like bowing) and lifting it off the ground to my chest. I crouch down, brace it to my chest how I want to carry it, and basically stand up.

I have a window air conditioner unit, if I try to lift it up just bending over 45 degrees, more often than not I will twinge my back, always gotta crouch, brace, and stand.