What is the correct procedure for lifting heavy objects safely?

The correct procedure for lifting heavy objects safely involves bending at the knees, keeping the load close to the body, and avoiding twisting motions. This technique is essential for several reasons.

Firstly, bending at the knees allows the legs, which are stronger than the back, to do the majority of the lifting. This reduces the strain on the lower back, which is a common site of injury during improper lifting. Secondly, keeping the load close to the body minimizes the lever effect that occurs when holding an object farther away, which significantly increases the amount of force exerted on the back muscles and spine. Lastly, avoiding twisting motions while lifting prevents rotational strain on the spine, which can lead to injury.

In contrast, options that suggest bending at the waist, extending the arms, or using only the arms for lifting lead to improper lifting techniques that can cause accidents or injury. These methods do not adequately use the body's strength and stability provided by the legs and can put undue stress on the back and shoulders.