What is the proper procedure for lifting a box to prevent injury?

The procedure of keeping your feet shoulder-width apart, bending at the knees, and lifting with your legs is crucial for preventing injury while lifting heavy objects. This method utilizes the strength of the leg muscles, which are much stronger than those of the back. By maintaining a stable base with your feet positioned apart, you enhance your balance and reduce the risk of losing control while lifting.

Bending at the knees allows you to lower your body in a natural position, reducing stress on your spine and minimizing the chances of straining your back. Lifting with the legs, rather than the back, helps distribute the weight more effectively and engages the larger muscle groups in your legs, providing more power for the lift while keeping your back in a safer, neutral position.

The other options suggest methods that could lead to injury. Keeping feet close together could compromise balance, and bending at the waist places excessive strain on the back. Lifting quickly may lead to improper form and increased risk of injury due to lack of control.