My current training consists of 6 days on, 1 day rest per week. I do upper body plyo and lower body plyo 1 time each per week. Here is what my training schedule looks like. Im not sure how often plyo should be done, but I have read no more than once per week. Since I split between upper and lower body I am doing 2x per week. I dont feel like im over training, but some weeks my body is very wore down and I have to take an extra rest day.
Mon - Cardio / Martial Arts training
Tues - Legs/ Lower body Plyometric training (25 rep squats followed by various plyo exercises)
Wed - Weights(ARMS,BACK)
Thurs - Cardio / Martial Arts Training
Fri - light cardio, or rest depending on how body feels
Sat - Martial Arts training + Upper Body Plyometrics/Weights(complete upper body plyo rebound bench, throws on smith machine, plyo-pushups + standard upperbody lifts)
Sun - Rest