I bowl down a carpeted hallway into a cardboard box trap I made. It helps, a lot. It doesn't work 100% because the slide isn't there but it's great to work on swing plane, staying behind the ball, wrist positions, you name it. I also have a mirror that faces me which is a great visual aid not afforded to you on "real" lanes to visually check my backswing as I do it.
I think it's a great idea, combined with real lane time is a useful tool.
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