Final answer:
When lifting boxes over 16 kilograms, it is recommended to use machinery or seek assistance rather than lifting manually.
Step-by-step explanation:
When lifting boxes over 16 kilograms, it is recommended to use machinery or seek assistance rather than lifting manually. Lifting heavy objects manually can put strain on your body, especially if you are not trained or experienced in proper lifting techniques. By using machinery such as forklifts or cranes, you can safely lift and transport heavy boxes without risking injury. Alternatively, seeking assistance from others can also help distribute the weight and make lifting easier.