What is the safest way for two individuals to carry a heavy sofa?

Using tools like a dolly or furniture sliders is the safest way for two individuals to carry a heavy sofa because these tools are specifically designed to handle heavy loads with minimal strain on the individuals. A dolly allows for vertical lifting to be replaced with horizontal movement, which significantly reduces the risk of injury from lifting heavy objects. Furniture sliders enable individuals to easily glide the sofa across floors without the need for substantial lifting, thereby also protecting their backs and joints.

In contrast, the other methods involve more direct physical exertion and increase the risk of accidents. Lifting from the front and back or trying to lift both ends simultaneously can create an unstable situation, where the weight might not be evenly distributed, leading to strains or spills. Additionally, relying on only the stronger person to take the lead may put excessive strain on that individual and does not ensure that both people are equally engaged and able to maintain control of the sofa during the move.