Self propelled lawn mower
You can either push a lawn mower yourself or you can get a self propelled lawn mower which pulls itself along using the power of the engine. They are sometimes referred to as autodrive or automatic lawn mowers. Self propelled lawn mowers are great to reduce the effort required to mow the lawn. Your lawn could be strenuous to cut because you have a sloped lawn, you have a very large lawn or perhaps you just find it physically challenging to cut the lawn. Whatever your reasoning everyone will find it much easier and quicker to use this type of mower.
Most self propelled lawn mowers you can vary the speed so you can go fast or slow. Some will even automatically adjust to the speed you are walking.