Tree Stump Problem

[babylark]

I have a very stubborn stump that is in the middle of a new garden plot. It's a Magnolia Tree that we cut down several years ago. I keeps sprouting and we cut off the new growth.

Yesterday I tried to take the shovel and axe to it, like I do with all the stumps, and it kick my butt. I'm really sore today and didn't get very far.

Anyone have any suggestions for rotting stumps or killing stumps quickly. My Dad tried the commercial stump rot stuff and that didn't work on an old Maple. Any suggestions or ideas? My back will appreciate it!