The VertiMax®, a resisted jump training apparatus similar to the spe- cific strength exercises described above, appears to improve lower body power and vertical jump performance. The V6 model VertiMax® has the capability to train the arms via resisted shoulder flexion during the jumping to possibly improve the arms’ contribution to power production and jump height. Although this resisted jump training has shown improvements anecdotally, few controlled studies have been imple- mented to determine the effectiveness of the apparatus. In addition, these studies differ in their conclusions about the effectiveness of VertiMax® training.