I adore TaeBo Advance, I think that our body gets used to some kind of workout and you become so familiar with using that group of muscles, then you try something new and WOW.. you are like a total beginner.
I once heard that we need to keep the body guessing in order for us to get results and conditioning..

It seems that is what you are doing, keep it up, this taeboo is so much fun and then you start buying all the little outfits and stuff for your hands, is great.. At this moment I can't do kicks but I remember it was great.