Ergonomics, Ergonomics! You hear that term so much these days. When cleaning carpeted stairs, ergonomics are very important. There is a flat step and a riser that both need cleaning. In the past, you needed to be a contortionist to clean stairs, but no anymore!! This innovative new stair tool allows you to clean stairs without turning and twisting your arms and wrists. The tool does all the twisting and turning for you!