Gas Power auger recommendations

And I AM NOT DOING THIS BY HAND!! LOL I dont mind doing some digging, but 3-4 foot depth and over a dozen holes ...fuhgettabout it!! I do need the excercise, but my back is already screwed

Well, it was just a thought, LOL. I know after I got done I could hardly pick up anything for a week, my hands and forearms were so weak.