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Exercise in the Skies is the first Secret Level in Super Mario World 2: Yoshi's Island. The level starts out with Yoshi in a small grassy area, soon after there will be a cliff, where the player needs to ride a Flatbed Ferry upwards. The Player will then ride another Flatbed Ferry, that will fly on and off of the rails several times, after that the Player will need to ride several more Flatbed Ferries, until they will wind up on top of some clouds.
Once there the Player will find a Middle Ring, and a door, through the door is just more clouds, after crossing a long gap, the player will find another door. Through this door is more clouds, and more platforming. After riding some Flatbed Ferries, the player will get to another Middle Ring.
After that the Player will need to ride another Flatbed Ferry going downwards, after that the player will need to ride another Flatbed Ferry, and will then be jumping along many small falling platforms. After that the Player will need to hit a ! Switch to make red blocks appear, after jumping along those the Player will clear the level.