Didn't have radar gun on them.. but they were throwing heatBy bring it, are we talking 55+? 60+?
In my experience it is difficult to explain hitting the changeup to teens but videoing, have them watch the video to see their failures, and then having them take reps on live pitching until they get it right is the best practice. I say this because it is a timing mechanism and the only difference is adjusting your timing.
Another aspect to the change is its propensity to drop. Video will give you the determination of is it timing or is it swinging over the drop. If the timing is right but they are swinging over the drop then the process for correcting it is an easy fix, timing fixes are much more difficult and the best way to accomplish it is through live pitching to get them to understand how to make the timing adjustment.
Yep the change up drops.. but these girls are out in front