When lifting a heavy object from the floor, your legs should be straight and firm while using your back muscles to straighten up the rest of your body.

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When lifting a heavy object from the floor, your legs should be bent and positioned shoulder-width apart to provide a stable base. Your back muscles should not be the primary muscles used, but instead, you should use your legs to lift and then straighten up your body. It's important to keep your back straight and use your abdominal muscles to stabilize your spine while lifting.

When Lifting a Heavy Object from the Floor, Your Legs