Table 2. Mean (± SD) serve velocity, serve accuracy and shoulder rotation comparisons between pre-test and post-test measurements for the control and training groups. Group Pre-test Post-test Effect size Serve velocity (km·h-1) T 150.3 (12.3 157.9 (12.5) * .41 C 146.1 (10.7) 146.6 (10.4) .01 Serve Accuracy (points) T 12.2 (2.5) 13.5 (3.6) .29 C 12.5 (2.5) 13.5 (2.7) .25 Shoulder rotation (°) T 166.0 (20.2) 179.6 (14.0) # .50 C 161.4 (15.5) 169.6 (14.1) # .36 * Significant (p < 0.001) differences between training and control group. # Significant (p < 0.001) differences between pre- and post-test.