Which method is correct for lifting heavy objects?

Bending at the knees while keeping the back straight is the correct method for lifting heavy objects because it utilizes the strength of the legs and minimizes the risk of back injury. When you bend at the knees, you engage the larger muscle groups in your legs rather than relying solely on your back muscles, which are more susceptible to strain.

Maintaining a straight back helps to keep the spine in a neutral position, reducing the risk of injury and ensuring that the lift is safe and effective. This approach emphasizes proper body mechanics, which are essential for anyone, particularly healthcare workers or CNAs, who frequently lift and move patients or heavy items.

Other methods like bending at the waist can lead to back injuries as they put undue stress on the spine, lifting with arms only can cause muscle strain, and using a twisting motion can lead to loss of balance and increased risk of injury. Each of these alternatives fails to provide the proper body mechanics needed for a safe lift.