The GIRD assessment is part of the Performance Plus Assessment Series. GIRD is the difference in total motion of rotation between your shoulders. Your IR + ER = Total Motion for each arm, and that number should be close between each arm. Some pitchers gain significant external rotation due to throwing a lot at a young age while some do not, but keeping these numbers close is vitally important. To pass the GIRD test, total motion should be within 5-10 degrees of each arm.