@Soulfox -- and anyone who has seen one of those in action should know how physically demanding they can be. It takes some real strength and endurance to use one of those for long.
Plus, they are a bit of a safety hazard because they tend to throw stuff all over the place. The noise level is a hazard, too. For all of those reasons, you'll notice most people operating jackhammers are muscled up and wear head, eye and ear protection.