From the Super Mario Wiki
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Seesaw Fit is a panel found in the underground area of Bowser Castle in Mario & Luigi: Bowser's Inside Story. It is connected to a track on the room wall and functions like a seesaw. By using body slam on the panel, Bowser adds to its potential energy and it goes higher after a U-turn. Doing this repeatedly allows Bowser to reach the higher areas of the room, including an exit to the west.