Strength training plus plyometric training. Group P (n = 9) performed strength training and plyometric training. The strength-training program was the same as the strength-training protocol described previously. The plyo- metric program was identical to the exercises performed with the VertiMax® training protocol without the use resistance provided by the VertiMax®. This was done to insure that the plyometric group would have the same number of foot contacts and exercises as the resisted jump-training groups. The plyometric exercises were varied at week 3, but the exercises chosen were selected based on the take-off and landing protocols of the jumps being consistent with that of the jumps used on the VertiMax®