How should you lift a heavy object safely?

Bending at the knees and keeping your back straight is the safest way to lift a heavy object. This technique utilizes the strong muscles of your legs to bear the weight, while maintaining the natural alignment of your spine. By bending your knees, you lower your center of gravity, which allows for better balance and stability when lifting the object. Keeping your back straight minimizes the risk of injury to your spine and reduces the strain on your back muscles.

Using your arms to lift the object or lifting with your arms extended can lead to improper posture and increase the risk of muscle strain or back injury. Twisting your back while lifting is particularly dangerous, as it can put excessive stress on the spinal discs and muscles, leading to injuries. Therefore, using the proper lifting technique, as indicated in the correct answer, is essential for promoting safety and preventing injuries during the lifting process.