I never quite understood the idea that stump shooting is the best hunting practice, unless you hunt by stomping around the woods shooting at various stuff.
Sure, it's a lot of fun but it doesn't do much for a guy that spends 99.9% of his bowhunting sitting motionless in a treestand, a popup blind or a ground blind.
To me, the best bowhunting practice is done with the help of a buddy, in the treestand or blind that you actually hunt from.
One guy shoots a dozen or so shots while the other places foam balls, chunks of styrofoam or whatever you want to shoot (including foam animal targets), at varying distances. The shooter only gets one shot at each target. After one or two dozen shots, you switch places.
It can be loads of fun and a lot of good practice, especially if you have a friend with a sense of humor and likes to place the "targets" in strange positions...just like real critters like to do.