There are many factors that contribute to making a heavy object safe to lift and move. First, the object must be sturdy and not likely to break or crumble under its own weight. Second, the object should be well-balanced so that it is not top-heavy or bottom-heavy and does not have any sharp edges that could cut or puncture skin. Third, the lifting person must have a good grip on the object, using both hands if necessary, and be careful not to drop it. Finally, it is always best to lift with the help of another person when possible.