The Salted Fish King in the Pirate World

A boy who traveled through time to the world of One Piece. After he traveled through the past, how did he become stronger as an ordinary person? If it was normal, it would definitely be exercise. However, after the boy just started exercising, he discovered that since he had a system, this system seemed not quite right, because the system was a salted fish system, so for the boy, exercise was not as promising as being a salted fish. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.