Final answer:
A patient weighing over 250 pounds should not be lifted with fewer than four rescuers. Proper lifting techniques are crucial to protect the spine, which is weaker than other body parts and subject to significant force when lifting incorrectly.
Step-by-step explanation:
You should not attempt to lift a patient who is more than 250 pounds with fewer than four rescuers regardless of individual strength. When lifting heavy loads, it is essential to use proper lifting techniques to prevent injury. This involves keeping the back erect and using the legs to raise the body and the load, which significantly reduces the forces exerted on the spine. Given that the spine is relatively weak compared to other body structures such as hips, knees, and ankles, minimizing the force on the back is crucial.