In baseball there has been some research on this, I'm not sure if the results can be extended to softball. In baseball an increase in velocity brings an increase in spin rate. And it's also pretty much accepted that you can't change fastball spin rate, while it varies from player to player a given player has his own limits. If you want to read up on it go here.If your spin rate goes up on the FB will speed increase, both 12/6 rotation?
Spin Rate: What We Know Now
This article is intended to build a basis of knowledge of what we, at Driveline Baseball, understand about spin rate at this current time. We will
www.drivelinebaseball.com