I suffer from degenerative disc disease and spinal stenosis, among other back problems.  I've always worked out and kept in shape.  Since my back condition has worsened, my dr recommend that I stop lifting heavy weights and try using different exercise bands.  I've been using these BMP resistance bands for several weeks.  I absolutely love them.  They are very convenient to use, especially if you travel.  I can adjust the amount of weight or resistance by the color of the bands .  I use the bands to do a variety of exercises, in place of swinging my heavier iron.  Great for building strength by doing more reps with less weight.  I highly recommend this company, as well as, these bands.