Muscle Science: Sorry for the confusion, by cardio I just meant 30 minutes a day of running. The reason I suggested it like that was because, the OP is not really breaking up his jump training schedule properly. From what my trainers taught me in highschool, you have to break plyometrics into 4 phases: strength, plyometrics, speed, and finally endurance training.. and run each one of these phases for a week at a time. And then you cycle the 4 phases continuously for 2 - 3 months straight, in order to maximize results. Am I right about this?? You have a degree in kinesiology right?? I think I've read your "ask me anything" thread..