Let me tell you how great spinning is! I notice a huge difference in my "cycling shape" when I get out on the road in the spring. I teach several classes a week and I have been addicted for years (probably why I became an instructor) Definately need to mix it up with some strength training and core training (pilates, resist-a-ball, bosu type stuff) Get into the pool once in a while too. Spinning is the only thing that helped shed 35 lbs, give me toned legs and rear, my cardio system is in top shape (my resting heart rate used to be 60 + a min, now down to 46-48 ish) brought cholesterol down, gives me mental focus and has taken away the effects of seasonal affective disorder ( I live in the rainy Northwest) and gets my endorphines pumping! The thing that is most enjoyable is to watch people "get it" and become addicted themselves. I just turned 40, I have always been active but I feel I am in the best shape I have ever been both in fitness and in health. Train right and you will see the transformation! Most of all.. have fun!