Which of the following is a principle of good body mechanics?

Maintaining the natural curve of the spine when lifting is essential for good body mechanics. This principle helps to distribute the weight evenly across the spine and reduces the risk of injury. When the spine is kept in a natural position, it minimizes strain on the back muscles and ligaments, which can lead to long-term health issues if not adhered to.

Using the natural alignment of the spinal column allows the body to utilize its strongest muscles—the legs and core—for lifting, rather than relying solely on the back. This principle is particularly important when handling heavy objects, as it aids in maintaining balance and stability, thus ensuring safety for both the individual lifting and those around them.

Other options do not prioritize safety or proper body alignment. For instance, bending at the waist or twisting while lifting can create undue stress on the back, increasing the likelihood of injuries. Lifting with only the arms ignores the strong leg muscles that are designed for such tasks, which can also lead to strain and potential injury.