Australian inventors Brendan Corry and Peter Sargent designed the Wunda Weeder. This fanciful garden gadget is self-propelled, thanks to the solar cells on the roof. A gardener can lay on the cot and weed rows of plants in his/her garden while staying cool in the shade.
http://wundaproducts.com.au/home/products/wunda-weeder/ via OhGizmo! | Photo: Wunda Products
Exercise from weeding? No. Back and knee pain? Yes.
http://www.abc.net.au/tv/newinventors/txt/s2930576.htm