I bought these bands as I do the Turbo Jam workouts and one of the workouts is 'totally tubular' which I had been doing using free weights. So I thought I would give these a go, they are so much better than free weights, you work (i think) more muscle and you can adjust the position of your feet etc to really make the bands work! I woke up this morning aching so I know I've worked hard! I would recommend these bands. I know there are lots of different sorts on the market and some that are quite expensive too! These were very well priced. And don't be fooled into thinking they are too stretchy! After a few bicep reps you can really feel them working!