I was amazed when I first tried this product. It's simple and very useful, however the instructions included with the product are almost useless. They have poor spelling and grammar, do not say how many reps to do with the product to see results, etc. I searched Google with the phrase "How to use a Thighmaster" and the eHow article helped me out a lot. Now I can really feel the muscles I'm exercising (thighs, upper arms, chest, and even stomach!) and it's fast and easy.