To determine if you can safely lift an object, it's important to assess your physical capability and the weight of the object. Pushing the object with your foot may not give you a clear indication of its weight or your ability to lift it. Measuring the object can provide information about its dimensions, but does not directly assess whether you can lift it safely. The best method is to attempt to lift the object carefully and pay attention to how your body feels. If you feel strain or discomfort, it is a sign that the object may be too heavy for you to lift safely, and you should seek assistance or use proper lifting techniques.