That is OVERTRAINING.

I see what you are doing, like 3 days a week upperbody, 4 days a week lowerbody etc. You are only giving yourself 24hrs for each muscle group to rest and recover, which is not enough. Look at something like Joe Defranco's Weside for Skinny Bastards, he has his athletes doing upperbody for 2 days a week. Google Defranco's Website and do it. He also has a day dedicated to pylometric training in it too btw.

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Great, and it is done by various athletes. I'm currently doing it too. Plus for beginners, you have to develop a strength base first befroe doing explosive stuff like pylo's.