Dealing a greater range of damage
The Spin Attack is a recurring sword technique in The Legend of Zelda series.
To perform it, the player must hold down a button and release it. In a game that has a Magic Meter, they can hold down the button for a longer time to charge up their sword, and then release it to perform a more powerful Spin Attack.
In Skyward Sword, the player must swing the Wii Remote and the Nunchuck horizontally or vertically to perform a Spin Attack. To perform a more powerful Spin Attack, they must charge their sword by raising it skyward beforehand.