08/28/2026
We didn’t pick 4, 5, 6, and 7 ounces at random.
The TAP® Pitching Range™ was built where two research lines overlap:
Historical weighted-baseball training studies that found velocity gains largely centered around 4 to 6 oz.
A separate mound biomechanics study that directly tested 4, 5, 6, and 7-ounce baseballs against a regulation ball.
In that mound study, body position changed very little across the range. Measured arm stress did not increase at 4 or 6 oz relative to a standard ball, and key measured kinetic values were lower at 7 oz.
That does not make the set a universal program. It does not guarantee velocity, settle the long-term injury question, or replace assessment, supervision, workload tracking, and a broader throwing plan.
It explains why we built a narrower set—and why we put the research, its limits, and the full annotated bibliography in one place.
Read The 4-to-7 Ounce Range:
https://bit.ly/4y5QGxU