I decided to start exercising at home since it was more convenient than going to the gym.  I didn't have the money or space to purchase a set of free weights, so I read about these resistance bands.  I assumed I wouldn't get the same kind of workout than I could from using all the different machines at the gym...but I was wrong.  I can do almost anything with these resistance bands, and I can really feel the workout.  I used pretty heavy weights at the gym so I thought I might end up needing more resistance but I typically use at most two bands and not even the "heaviest" ones.  The manual that comes with the bands has pages of different exercises and I haven't event gotten to every one of them.