SETPRO
DFP Vendor
- Dec 28, 2023
- 53
- 18
In fastpitch bullet spin is generated the other way, fingers sliding under the ball at release.
Totally agree.
That's why said it was a "my hypothesis".
The point I was also trying to make is that I don't think you can get that kind of speed on the pitch without good IR. Which is what I was also referencing to why lostcreek1 daughter was gaining speed with here 360 pitch. Specifically that when she threw the 360 that unconsciously she possibly was getting more of an IR arm path.
With respect to the bullet ball IR is predominant in terms of getting the rotation of the ball off of the index/forefinger. This is the rolling/raking affect that I speculated was taking place except I thought it happened over the ball as opposed to under the ball. Again my fastpitch ignorance.
Some points that I should've made her want to make but bailed out too soon with respect to Arm whip/IR discussion.
1. IR is driven by internal rotation of the shoulder (humerus). But what "sets the stage" for IR is ER (external rotation). External rotation preload the upper shoulder complex pre-tensioning so to speak to unload into IR.
2. Horizontal abduction abduction of the shoulders is important component of effective IR implementation. You can see this in a number of high-level fastpitch pitchers where there is a flexing back of the shoulders (adduction) and then bringing back together again (abduction). You can especially see the abduction after the ball is released.
Thanks again to ArmWhip for pointing out my misinformation.