Purpleinopp this is for you.
Don't dig the grass. Leave it for the earthworms.
I have had 3 back surgeries. The last was to "install hooks and screws" and a cage to keep the vertebra from collapsing. Please take care of your back! The pain you feel now is minor to what it will be if you rupture a disc.
Read this link on lasagna gardening.
Here is a link that might be useful: lasagna gardening.