You can choose from three different types of swings when batting.

Normal Swing
This is the easiest way to bat and only requires pressing the button at the right time.

Power Swing
This swing requires you to hit the ball at the correct area of the nine-segmented strike zone at the right time.
Though the chance of getting a strike is higher than the Normal Swing, it's easier to get an extra-base hit thanks to the faster batting speed.

Super Swing
The Super Swing is available by holding on to a specific button while in Power Swing mode.
While the aim size has been reduced greatly, it's a good way to swing for those who want to hit the ball really hard.