NPA Velocity Plyoballs for Arm Speed & Durability (6-pc Set)

These are the official NPA weighted velocity plyoballs. A set of six balls and carrying bag. This is what started it all! The current overload/underload phenomenon to increase velocity started with this program originally developed at the NPA (National Pitching Association). It has been known for decades that overload/underload training increases throwing velocity. In fact, Dr. Tom House, the founder of the NPA, did his first weighted ball study with Dr. Coop DeRenne back in 1985 which confirmed the validity of weighted ball training. Fast forward 20 years and the NPA finally developed a protocol that avoided arm injuries. 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! If you'd like the throwing protocol included then head over to the National Pitching Association and order the balls with the throwing programs directly from there.

• Official NPA weighted velocity plyoballs Carrying case included Protocol to avoid arm injuries Fix GIRD (glenohumural internal rotation deficit)