I know that you always recommend doing a variety of different cardio workouts in your rotations, etc. I'm wondering if it is necessary though? For example, I just started doing Rhythmic Step and I love it, I did it 6 days in a row and finally got all the steps down (yeah, I'm a tad bit uncoordinated!!) and I'd like to keep doing it this week since it's so much fun. Is there any harm in doing the same cardio workouts day after day??