According to Mantis;

“The Mantis Tiller/Cultivator is lightweight, but powerful enough to till through sod and compacted soil. Our unique, patented serpentine tines turn soil into a fine texture, ready for planting, and are guaranteed for life against breakage! At 20 pounds it’s easy to carry – to the shed, to the car, or to your neighbor who can’t wait to try it! Great for senior gardeners, too!”

Here is a video showing the Mantis Tiller in action;