If you have been doing this routine for a while and are not seeing the results you want, you have right there every motivation and validation you need to change things up. The body responds positively to change, in fact, it needs it in order to keep delivering on the results we all want to see, lean, tight, muscular/athletic looking bodies.
So, you have different ways of introducing change. You can vary the type of cardio that you do, as A-Jock suggested, and you can vary the type of cardio that you do with the same methods. So, you can still do your treadmill workouts, but you need to make sure that you are not hopping on and doing the same tired old workouts every time. The body adapts very quickly, and what used to work for you no longer produces the same results. Your body has gotten very efficient at that treadmill workout (and at KPC) and no longer expends the same number of calories that it used to do to do the same workout. Here's where intervals come in, not to mention increasing the speed of your power walking or running on the treadmill in a steady state fashion. And the treadmill has inclines that you must make the most of! So, experiment with giving yourself treadmill intervals of 2-3 minutes where you alternately jack up the incline or speed and really get the heart pumping. Plus inclines will do great things for the glutes and quads.
I am going to suggest that you either borrow the following book from your library or invest in it from amazon.com, which has the cheapest price. It is well written, funny and intelligent. It will finally convince you, not to abandon cardio altogether becaue cardio is still a vital component of a fitness program, but it will give you the courage you need to drop 2 cardio days from your current regime and pick up heavier weights on those days in a consistent fashion, to really develop some muscle and drop those pounds for good.
"The New Rules of Lifting for Women" by Lou Schuler.
It is not that you have to follow the plan of weighted exercises that are laid down in the book religiously either. Just read the theoretical portion of the book and take it from there. All the cardio you are doing is not getting you the results you want. This book will explain to you exactly why and how to get those results. What you will then discover is that Cathe's weight workouts include pretty much all of the recommended weight exercises included in the book, so it is a nice companion to her DVDs.
I mentioned earlier that results come from changing up your routine and not allowing the body to become overly proficient at the same type of exercise. The other major rule, adherence to which will help you make the desired chamges in your body, is that with weight training you need to gradually overload the muscles with increasingly heavier weights. Do not fear the words "heavy weights". They will not turn you into the incredible hulk nor does anyone expect you to start pumping iron with 50 pound bicep curls overnight, if ever, actually! Progressive overload takes time. It can take several years to gradually mold a physique, but luckily, the benefits of weight training can be seen quite quickly. You will have more energy, your body will get tighter, you may drop several dress sizes but not necessarily drop too many pounds because muscle tissue is dense and takes up less space than fat cells in the body. You will feel great. A stronger upper body helps you to power through treadmill running workouts, believe me, and stronger legs will have you powering through KPC and other kickboxing workouts you get.
I suggest you invest in either STS, which will provide you with everything you need for weight training, it will be a superlative, all encompassing system, or a couple of Cathe's already released series to get started with some heavier weights. Try S&H and Gym Styles. This may seem a large expense but think about it: you will have these DVDs for life and you are investing in health for life.
Cut your cardio down to 4 sessions per week and add in extra strength training and watch the changes this will make to your body. What do you have to lose? Body fat. What do you have to gain? More strength and power and increased self confidence, not to mention a new wardrobe for that leaner body you will be building!
Clare