Strength and conditioning professionals have emphasized the importance of training the trunk with respect to its effect on sport performance and reducing the potential for injury. However, no data on the efficacy of trunk training supports such claims. The purpose of this study was to examine the maximum differential rotation and maximum angular velocities of the pelvis and upper torso while performing 4 trunk exercises (seated band rotations, cross-overs, medicine ball throws, and twisters) and compare these trunk exercise kinematics with the trunk kinematics demonstrated in actual throwing performance. Nine healthy NCAA Division I baseball players participated in the study. Trunk kinematics were analyzed using 3-D high speed motion analysis. Each participant's trunk kinematics were analyzed while they performed 5 repetitions of each exercise in both dominant and non-dominant rotational directions. Results indicated that all 4 trunk exercises demonstrated maximum trunk differential rotation (52.0 ± 7.1º) equivalent to maximum differential rotation demonstrated (approximately 45-60º) in elite pitchers (Stodden et al., 2001; Hong & Roberts, 1993; Zheng, 2004). Average maximum upper torso (449.2 ± 72.7.0º/sec) and pelvis (297.6 ± 70.7º/sec) angular velocities in the two exercises performed for velocity (medicine ball throws and twisters) were appreciably slower than the angular velocities demonstrated (upper torso = 1100-1300 º/sec, pelvis = 500-700 º/sec) during throwing performance (Stodden et al., 2001; Matsuo et al., 2001). Overall, the four trunk exercises demonstrated differential rotation equivalent to elite throwers, but the angular velocities produced did not approach the angular velocity levels demonstrated by elite throwers. Results of this study should emphasize the need to identify and implement appropriate trunk training exercises that are sport specific and demonstrate sufficient ranges of motion and angular velocities.Keyword(s): athletics/sports, exercise/fitness, performance