From the Super Mario Wiki
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“The latest kingdom fad! It's Seesaw Fit! Bowser Castle debut! Jump as high as you can and slam down on the seesaw! Ride it, and when the seesaw peaks, jump and slam again! Slam your past regrets! Slam your worst memories! Slam and slam some more! Both stress and unwanted fat will slam away!”
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.