The Wii Fit Trainer is a newcomer fighter appearing in Super Smash Bros. for Nintendo 3DS and Wii U. She was unveiled at E3 and was the third newcomer to be revealed. You can choose one of two Trainers to help whip you into shape - or better yet, whip everyone else into shape! Use all sorts of yoga poses . Jan 09, · Wii Fit Trainer - Super Smash Bros. for Wii U / 3DS: The lean, mean, exercise machine debuts in battle! The Wii Fit Trainer is a confirmed character in the upcoming Super Smash Bros. for Wii U/Ni.