The Wii Fit Trainer and the Wii Balance Board are both characters appearing in Wii Fit, which requires the real-life Wii Balance Board to play.
The stage features the Wii Balance Board as a background character, referencing how the Wii Balance Board appears with Wii Fit Trainer's on-screen appearance.
The Move Speed ↑ and Easy to Launch rules reference how Wii Fit is designed as an exercising game and weight-loss program, thus reducing the player's weight and increasing their speed and stamina over time.
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Not just a simple accessory, the Wii Balance Board itself is part of your fitness team, too! Able to track weight shifting, it turns your body into the controller. In-game, it’ll be your guide through the various Wii Fit activities, tracking your progress and encouraging you to do your best. In Smash, its Spirit teaches the Lightweight style, increasing move speed and jump height, but decreasing offense, defense, and weight.
