STS and Kickboxing with a heavy bag, ok to do both?

[cldonadio]

I have used Cathe dvd's for 6 years but last year I also joined a kickboxing club where we punch a true heavy bag. The workout includes boxing, abs, legwork without weights and alot of drills involving push ups and squat thrusts. I usually do this 3 times a week and cathe's weighted workouts the other 2-3 days. I am committing to the STS program so I was wondering if that in combination with the boxing would be too much for my body. How should I combine both if at all?

thanks,

christina