The pitchLogic STUFFpL system can recommend up to three adjustments for each pitch in your arsenal. We recommend picking one at a time to focus on, setting a goal, and repeating the STUFFpL assessment for updated recommendations once you reach your goal.

One recommendation you might receive for changeups is an adjustment to your Spin Efficiency. Learn what Spin Efficiency is, how it affects your pitch, why pitchLogic might recommend a change, and how to make an adjustment to your Spin Efficiency below!

Spin Efficiency is the percentage of Total Spin that contributes to creating Movement on a pitch. The higher the percentage, the more the ball will move up, down, left, or right. Only Backspin, Topspin and Sidespin create force on the ball to make it move up. Riflespin, also known as gyro spin, creates no lifting force on the ball and reduces Spin Efficiency. Pitches with a high Spin Efficiency are sometimes described as spinning true or clean. Pitches with a low Spin Efficiency are sometimes described as spinning off axis, tilted, or spinning like a football.

Changeups typically have high Spin Efficiency - 90-100% is common. Splitters can vary over almost the entire range of Spin Efficiency, depending on each pitcher’s unique way of releasing the ball.

A higher Spin Efficiency will result in more Movement toward your Spin Direction (blue arrow). A pitch with 90% Spin Efficiency will have approximately 90% of the Vertical and Horizontal Movement of a similar pitch with 100% Efficiency.

Pitches with a lower Spin Efficiency are more likely to create seam-shifted wake Movement. This type of movement acts at a 90-degree angle to Spin Direction and can be significant for changeups.

Changeup speed usually goes up slightly with increasing Spin Efficiency, because the fingers are pushing more directly behind the ball instead of off the side.

The pitchLogic STUFFpL system anticipates all these effects before making a Spin Efficiency recommendation.

Changeups often have a high Spin Efficiency but vary a lot depending on your personal style of changeup.

Higher Spin Efficiency may help create more Horizontal Movement, but lower Efficiency can decrease Vertical Movement (for more ‘sink’). pitchLogic’s STUFFpL system can help determine which of these changes would benefit each individual pitch.

To increase Changeup Spin Efficiency, be sure you are staying behind the ball at release. Pronating your arm at release (think of pointing your thumb down) often helps increase Spin Efficiency as well.

To decrease Spin Efficiency, allow your fingers to roll off of the ball slightly off center.

For splitters, Spin Efficiency can be harder to control, but try shifting pressure toward your index or middle finger and observing the result.