Is there a such thing as too much cardio?

DeMarraDontStop

I've heard some rumblings that doing to much cardio is counterproductive and is not needed.... For instance one does an hour of cardio / strength and turns around and do an aerobics class (i.e. Zumba) the class doesn't do anything for the body. Your thoughts?

MG_Fit

My trainer tells me that as long as cardio stays within 30 - 45 minutes on strength training day, you'll be ok.

My workouts Tues - Thurs consist of 45 minutes of strength and 35 minutes of cardio.