What should a worker do to ensure safety when lifting objects?

Bending at the knees and keeping the back straight is the correct approach when lifting heavy objects because it helps maintain proper body mechanics, reduces the risk of injury to the back, and allows for greater leverage and strength. This technique engages the larger muscles of the legs rather than the smaller muscles of the back, which are more susceptible to strain and injury.

When a worker bends their knees while maintaining a straight back, they are able to lift with their legs and core muscles, distributing the weight more evenly and reducing the stress placed on the spine. This method not only promotes safety but also increases efficiency when handling heavy loads.

Using the back to lift heavy loads, bending at the waist, or extending the arms while lifting can lead to improper lifting posture, increasing the likelihood of strain or injury during the lifting process. Therefore, adopting the practice of bending the knees and keeping a straight back is essential for ensuring safety in lifting operations.