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 that can be used by Bowser to cross the water to reach some other land masses. He can use it by going onto the wooden raft, then punch a wall the closest 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. It is mentioned by a Toad in Toad Town who says that Mario and Luigi doesn't have to use it because they're fit enough.