From the Super Mario Wiki
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Squid Fit, also known as Squid Diet, is a wooden raft that appears in Mario & Luigi: Bowser's Inside Story and its 3DS remake that can be used by Bowser to cross the water to reach other land masses. He can use it by going onto the wooden raft and then punching the closest wall to him to sail the opposite way. Mario and Luigi are unable to use the Squid Fit due to not being able to punch in this game. A Toad in Toad Town mentions that Mario and Luigi do not have to use it because they are fit enough.