We knew that GIRD (glenohumural internal rotation deficit) was a major predictor of potential arm injuries and so we went about trying to fix GIRD using a weighted ball program. After trying numerous iterations, not only did the protocol fix GIRD, it also led to safest arm speed increases we’d ever seen! In 2008 it was submitted to ASMI (American Sports Medicine Institute) for a peer review.
1 set of weighted balls
Weighted ball throwing protocol + video instructions